@fb0r, thanks for pointing out the cause of choppy animations (the dock). It looks like indeed Nvidia drivers need some work for MBP 2010 13". I remember a year ago when I installed Lion, it had the same problem of choppy animations and I waited until 10.7.2 until I reverted back to SL. I sent Apple Feedback at least 3 times but that didn't work either.
So, digging deeper into the problem, I found out that choppy animations may not be much of a Nvidia drivers problem. There is something more to it. Looking at this video and following the directions, it solved my sometimes choppy expose problem in SL.
http://www.youtube.com/watch?v=gmoWoeNrkOs
Going into the issue even deeper, I found out the main culprit was AppleGraphicsPowerManagement.kext. This is what the OS X uses to clock the GPU at 4 levels. When the Mac is idle, the GPU is clocked at 'level 1' which is the lowest clock speed (to save energy). However, when an app or OS X calls certain graphic intensive functions, then the GPU is triggered by the AppleGraphicsPowerManagement.kext to go to a higher level (such as level 4, which consumes more energy but gives really smooth animations).
I guess the problem with our Nvidia card is that the OS X is not kicking the card enough to go to the right level of performance when needed, which results in choppy animations. You can confirm this by following the youtube video I just linked. Some people comment that it not only solves the issue in SL and Lion, but also ML.
In response to your question, I saw someone's post in another thread that the dock results in choppy desktop changing animation in their 2011 Macbook Air as well
All in all, I think Apple should really work on optimizing the 2010 Mac Nvidia drivers, because a two year old computer is not the same as two year old phone.