No one asked, but I'm going to go ahead and assert that the best Photoshop icon they've ever done was the icon for CS2, with the icon for v7 coming in second.
I'd also be interested to know what changed after CS3 that cause the applications to feel a lot less responsive than v7 - CS3 were. IIRC, they started using a custom UI instead of using the native AppKit controls. But the performance started to tank after CS3, and it's never recovered.