I've been using Yosemite for about a month. Of course you can't stop the upgrade train. The night mode menus are actually a good feature, even if it kind of breaks aliasing and the look of the system. The middle-screen spotlight pop up isn't too bad. I still think I hate the notification center. I perform a task and then it logs in there 30 times. Its not necessary. Many apps are just a bit junky now. If I mistype weird screens like notification center or mission control / launchpad pop up and those are totally useless and get in the way.
While I don't like a lot of the new apps and features, I can't say I have a better alternative.
Other than that, I've been still creating new sounds on my V-synth every couple of days and play SNES (Yoshi Island. I've been thinking about making a new video of some kind.