CS3 is different than CS5.5, but I daresay I prefer it. For my smaller-sized projects, it's a smaller application to deal with, and it does essentially the exact same thing with the exact same quality.
So here's my workspace for most of my animations. I try to keep it as uncluttered as possible.
The guy in the picture is a remake of a REALLY old character for an animation concept I had almost two years ago.
When I finish all of those old characters I'll post for comparison.