I have CS6 and I have to say that it is a massive step forward. Adobe made over 2700 updates in things like default settings for tools, tool performance and speed, and streamlining the entire program. It is worth the upgrade for the the speed increase and the easy of use.
"I work from awkwardness. By that I mean I don't like to arrange things. If I stand in front of something, instead of arranging it, I arrange myself" -Diane Arbus