Re: Our users just want to get their work done
...and yet sales are fine. As for users, my users did grumble and complain when they got their first ribbon-ized Office, but they adjusted. Their proficiency may have lowered while they relearned it, but occasional users learned how to use the ribbon and power users didn't even notice it was there because the keyboard shortcuts still work.
That's one of the reasons Win8 is really bad. I think people can deal with a bit of a jarring UI change, as long as it still does what you expect it to do when you hit Ctrl-F, for example.