LOL you said that same stuff when I went to Windows 8. Doing so gained me a good 10-15% performance in games that support more than two threads so I don't regret it. Windows 7 now to me feels like XP. It's all well and good not liking change dude but sometimes you just gotta go with it because it's for the best. There's no way I would operate a PC with more than 4 cores or HT on Windows 7 now it's fucking donkey's years old.
I even liked the way 8 is/was and 8.1 was good too. Some people actually like it.
It depends what you want an OS to be.
I just want to it be, y'know, an Operating System which I use to run other things on (the clue's in the name!).
Now I'm not a total Luddite, I don't crave for the days when we had to install Winzip to work with zip files, and a JPEG viewer to look at Dutch anal porn, and stuff like that, so extra functionality built into the OS can of course be a good thing - but in essence I want an operating system to be fast, unobtrusive, and most importantly just work
As for performance boosts, properly using my four HT cores, and so on - yes of course that'd be nice, but I'm not going to do it at the expense of stability, compatibility, and so on. (I said over in the PC gaming hardware thread that I'd want to make sure all my old emulators work OK in 10 on a different PC before moving my main PC to it.)
Moreover, outside my occasional forays into the likes of GTA5, my PC is mostly used gameswise for the likes of Hearthstone, Pinball Arcade, WoW etc - none of which are at all demanding. (And since I got the 970 I can run GTA5 at 2560x1440 pretty much maxed out, so 'extra performance' is kind of a moot point anyway.)
I'll probably move over to Windows 10 within that one year window, but I'm definitely not jumping on board early doors, I'm going to wait and see what happens with DX12, and I wouldn't rule out sticking with 7 for years to come if 10 doesn't offer anything that makes it worth the switch. (In the same way I completely skipped Vista, going straight from XP to 7.)