I still use CS3 to do professional work. For what it's worth, I could probably be happy using Photoshop 7. I kept paying for upgrades, and I couldn't see that they did much for me but bloat the software and slow it down. don't need video in my photoshop. Don't need 3d. Once they had image slicing built in and the ability to record and edit actions, I haven't seen much new value (for me)
I've got a CSLive subscription too. Which is nice for moving around machines without having to do installs and license transfers. Otherwise, not any better than older versions as far as I can tell.