I may be "gaa-gaa" over anything Microsoft, but I'd rather be gaa-gaa for a UI that doesn't have stitched leather, or a reel-to-reel tape deck, or a fake paper ticket dispenser, or IKEA veneer bookshelves, or gradient metal, or doesn't have anything new in the UI in years, or the only color schemes you have available is grey, grey, blue scrollbar, grey, grey, gloss, white, pale blue folders, gloss, grey, black, grey, and a random galaxy wallpaper.
Maybe I'm just a hipster....
Now as for people not getting used to the UI changes, yeah that holds no stock whatsoever. There are ALWAYS, ALWAYS, ALWAYS.......ALWAYS, complaints about UI changes. What happens after a couple of years? There are almost rarely any complaints left. The ones that do complain are usually some oddities with an internet blog just to complain about the UI changes. Aero may be missed at first, then people get over it.
If I should say so myself, some of the complaints about the UI are so ridiculous, they can't even be taken with an ounce of sense or sanity. Like, "Windows 8 is the next vista." Most ridiculous claim ever. Or, "Windows 8 is Windows ME." Absurd. And there are the stupid cutesy nick names for it that I don't even KNOW what they mean. The complaints about full screen apps are a little more on the side of crying over split milk that hasn't been split yet. Don't like them, don't use them. Or the complaints about the Start Screen and organizing or launching apps, ummmm, don't know what to say as I can't physically move your hand to arrange them. It seems like some complain just to complain because they are so used to one they that they can't or don't want to try anything different, but say," I've seen and experienced more technological change than you'll ever imagine!" But this has been debated for months now.....no need to rehash.