Having been the generation that actually invented this stuff, (I worked for the guy that invented Random Access Memory btw), I tend to skip generations of software releases. I'm on 7 (I don't count 8 as it was mainly aimed at tablets) and I'll probably not upgrade until the one after 10.
I really don't want my desktop, main line PC to act or feel like a tablet. I'm happy with the UI just the way it is.