I don't bother with anything that I won't refer to in order to get the time.
Microwave? No. Cooker? No. Dishwasher? No. Washing machine? No. If your cooker is shit and flashes at you or refuses to cook until you set the time, then buy a better one next time. My laptop has NTP-synced time to a private NTP server with low-stratum peers, because I *DO* look in the corner of my laptop for the time. But if I stick something in the microwave or cooker, I want it in there for X minutes and that's *it*. I don't require any more UI. Hell, I can't even see the point of those microwaves that you can heat for 2 minutes, stand for 1, heat for another 2, etc.. Zap the damn thing for 5 and you're done. My microwave has (deliberately) precisely two controls - one for power (which could have "defrost" and "incinerate" and I'd be happy) and one for time. What else could you possibly want?
The more annoying thing is that I use mechanical timers for my fish tank and they get out of sync in power cuts. I'm just too lazy to buy a digital one, though, so that's my own fault. My fish must just think that that day was particularly short, that's all. And to be honest, I'm more worried about their pumps/heaters than the timing of the lights.
Everything else in the house is self-setting. I have a UPS and used to have all this stuff on UPS but it's just not worth the effort any more. The only thing on UPS now is the CCTV box (which powers the cameras too) but even that I feel it pretty worthless, and its biggest asset is the "beep beep beep" it does in a daytime power cut so you know what the hell is happening.
My alarm clock is battery powered, MSF-regulated, has twin alarms for me & my girl (amazing how many clocks don't support this), and I change the batteries about once every three years (it has a low battery warning for about a month before it dies - again, amazing how many devices don't have that). My laptop just runs. If the wifi goes off, that's what smartphones and dongles were built for. Chances are that you'll have 3G for hours even if the whole street goes off. If it really comes to it, then I can battery power anything that absolutely needs it.
Everything else in the entire house just goes on and off as necessary and "just works" when plugged back in again. Even the kitchen clock is MSF. The boiler is on a programmable thermostat which has a battery timer inside that. Even the little light in the driveway is timer/light controlled and uses a button cell to handle the actual timing. VCR's don't exist any more, and I don't have a DVR.
I absolutely do not understand why gadgets with clocks on aren't battery backed by at least a 50p button cell. If it dies in a power cut because it's been there ten years, so what, but working in schools I see computers every day that are older than some of the users using them, and their CR2032 is doing just fine remembering the time.
The only annoyance I had on this kind of thing was a previous mains-powered alarm clock that had a space for a 9v battery to backup the time in the event of a power outage. It never bloody worked, not even once, not even with tests with a fresh battery. Took it apart one day and found out that it didn't actually connect to anything at all, so that was probably why. But I got rid of that the second I saw my current Oregon Scientific MSF clock. And then immediately bought two of those instead.
The biggest problem I have now is actually in my car. If I do need to remove the battery (which I've done more often than I've had power cuts), then I have to reset the clock. But it has one button "H" and one "M", so it takes literally 20 seconds at worst case, and somehow keeps better time than any of my NTP-synched gadgets.