"It's worth turning on the (potentially) privacy-invading Cortana for that feature alone."
Yes, it's worth uploading all this to Redmond so you can check restaurant times:
"Cortana is your personal assistant. Cortana works best when it can learn about you and your activities by using data from your device, your Microsoft account, third-party services and other Microsoft services. To enable Cortana to provide personalized experiences and relevant suggestions, Microsoft collects and uses various types of data, such as your device location, data from your calendar, the apps you use, data from your emails and text messages, who you call, your contacts and how often you interact with them on your device. Cortana also learns about you by collecting data about how you use your device and other Microsoft services, such as your music, alarm settings, whether the lock screen is on, what you view and purchase, your browse and Bing search history, and more. You can manage what data Cortana uses, and what it knows about you in Cortana Settings and Notebook. More about the individual features, and how to manage them can be found at http://go.microsoft.com/fwlink/?linkid=522360.
Location services. Cortana regularly collects and uses your current location and location history to give you the most relevant notices and results and to make suggestions that help save you time, such as traffic and location based reminders. Cortana can only work if location services are on, so if you turn them off, Cortana will be disabled.
Text messages and email. Cortana accesses your messages to do a variety of things such as: allowing you to add events to your calendar, apprising you of important messages, and keeping you up to date on events or other things that are important to you, like package or flight tracking. Cortana also uses your messages to help you with planning around your events and offers other helpful suggestions and recommendations.
Speech and Input Personalization. To help Cortana better understand the way you speak and your voice commands, speech data is sent to Microsoft to build personalized speech models and improve speech recognition. On Windows devices, Cortana can only work if Input Personalization is on, so if you turn it off, Cortana will be disabled. See the Windows Input Personalization section for more information.
Apps and services. Cortana uses data collected through other Microsoft services to provide personalized suggestions. For example, Cortana uses data collected by the MSN Sports app so it can automatically display information about the teams you follow. It also learns your favorite places from Microsoft's Maps app so it can offer better suggestions. Your interests in Cortana's Notebook can be used by other Microsoft services, such as Bing or MSN Apps, to customize your interests, preferences, and favorites in those experiences as well. Cortana also allows you to connect to third-party services for additional personalized experiences based upon information you shared with the third-party service. For example, choosing to sign into Facebook within Cortana allows Microsoft to access certain Facebook information so that Cortana and Bing can give you more personalized recommendations.
Browsing history. If you choose to send your full browsing history to Microsoft in Microsoft Edge (see the Microsoft Edge description in the Windows section of this statement), Cortana can provide suggestions based on the sites you visit in Microsoft Edge. Cortana won't collect information about sites you visit in InPrivate tabs.
Search history. Your Bing search queries - even if Cortana does the searching for you - are treated like any other Bing search queries and are used as described in the Bing section."
And this is what Edge uploads...
"Microsoft Edge is Microsoft's new web browser for Windows 10. Internet Explorer, Microsoft's legacy browser, is also available in Windows 10. Whenever you use a web browser to access the Internet, data about your device ("standard device data") is sent to the websites you visit and online services you use. Standard device data includes your device's IP address, browser type and language, access times, and referring website addresses. This data might be logged on those websites' web servers. Which data is logged and how that data is used depends on the privacy practices of the websites you visit and web services you use.
Additionally, data about how you use your browser, such as your browsing history, web form data, temporary Internet files, and cookies, is stored on your device You can delete this data from your device using Delete Browsing History.
New features in Microsoft Edge allow you to capture and save content on your device, such as:
Web Note: which allows you to create ink and text annotations on the web pages you visit, and clip, save or share them;
Active Reading: which allows you to create and manage reading lists including websites or documents; and
Hub: which allows you to easily manage your reading lists, favorites, downloads, and history all in one area.
Some Microsoft browser information saved on your device will be synced across other devices when you sign in with your Microsoft account. This information can include your browsing history, favorites, saved website passwords, and reading list. For example, in Microsoft Edge, if you sync your reading list across devices, copies of the content you choose to save to your reading list will be sent to each synced device for later viewing. You can control which information is synced (see Sync Settings). You can also disable syncing of Microsoft Edge browser information by turning off the sync option in Microsoft Edge Settings.
Microsoft Edge and Internet Explorer use your search queries and browsing history to provide you with faster browsing and more relevant search results. These features include:
AutoSearch and Search Suggestions in Internet Explorer automatically sends the information you type into the browser address bar to your default search provider (such as Bing) and offer search recommendations as you type each character. In Microsoft Edge, this feature automatically sends this information to Bing even if you have selected another default search provider.
Page Prediction sends your browsing history to Microsoft and uses aggregated browsing history data to predict which pages you are likely to browse to next and proactively loads those pages in the background for a faster browsing experience.
Suggested Sites recommends web contents that you might be interested in based on your search and browsing history.
Browsing data collected in connection with these features is used in the aggregate and you can turn off any of these features at any time. These features will not collect browsing history while you have InPrivate Browsing enabled.
In order to provide search results, Microsoft Edge and Internet Explorer send your search queries, standard device information, and location (if you have location enabled) to your default search provider. If Bing is your default search provider, we use this data as described in the Bing section of this privacy statement.
Cortana can assist you with your web browsing in Microsoft Edge. If enabled, Cortana will collect your search queries and full browsing history, associated with a user ID. Cortana and related Microsoft services will use this data to learn about you and provide you with timely and intelligent answers and proactive personalized suggestions, or to complete web tasks for you. You can disable Cortana for Microsoft Edge web browsing at any time in Microsoft Edge Settings. To learn more about how Cortana uses data and how you can control that, go to the Cortana section of this privacy statement."
By the way, Cortana and Edge an excuse for uploading just a small part of your personal data to MS, there are far more... E.g. Bitlocker's recovery key also gets uploaded to the mothership.
Microsoft Privacy Statement