I've been working with PS for more than 10 years and I found a few things that should be tackled in future versions. However there is one feature which I am really missing ever since. It would have saved me a lot of time, and (to me) it's so obvious: projects!
I simply want to save my current status of photoshop, including my opened documents and their positions on the workspace.
The reason simply is, that I am regularely working with more than just a few files at the same time. I am in the games and web business working with lots and lots of smaller assets. If I need to shut down my computer (which is actually required in my company over night) then I have to reload all my files manually on the next working day.
I think this feature has to go into PS in one imaginable way or another after so many years. Even more as there are a number of other Adobe Tools (e.g. After Effects) which had that from the beginning. And PS isn't bound to one single field in graphics anymore - it's being used in many different ways - I gave you my example.
Please do me a favor and seriously consider implementing this in the next version.
If you need more input I'd be more than happy to hear from you ;-)