I'll throw my usage in too.
I've used Photoshop 7.0 for around 2 and a half years. Mainly through image modification of images of cars (Virtual modifying, woo-yay). My knowlege of Photoshop has helped me with morphing (I will post some up at some point, got some on a CD somewhere).
I did, a long time ago, use Paint Shop Pro 7.0, but then learnt how to use Photoshop, and in my opinion there is no better.