Remember all the user data that Redmond said went into crafting the Office Ribbon UI? Where do you suppose it came from?
I thought they'd plucked it out of their arses. Seriously.
Word and Excel were excellent programs till the ribbon, an exemplary implementation of Pink Floyd's "I've got thirteen channels of shit on the T.V. to choose from"
For neo-luddites wanting the authentic 2003 functionality, there is a lovely new toolbar you can install, called Ubitmenu - which looks like another ribbon tab but its all you need. It's free for domestic use and about a fiver otherwise, and as usual be careful on the install as you won't want any other crap they might try and install with it.