Earlier quoted context omitted.
How much of the "novelty itch" is something put there by software-company marketing to drive sales?
Sure, some of it might be. But so are many other habits that we have. Marketing is a part of our culture know, and is inevitably influencing us, for better or worse. Charles Duhigg talks a bit about this in his "The Power of Habit".
Office is a tool that works. People still complain about the Ribbon UI change, despite (possibly jusifiable) assurances that it really is a better UI.