At least not in terms of wanting to earn them just for the sake of having them.  I appreciate them when they add interesting goals that extend the life of the game.  So I would go back and replay a game to earn trophies if they fit into that category.  But I'm not going to put in a lot of time on something just to earn a meaningless notch on the belt.

It's kinda weird because before I bought a PS3, I was kinda into getting 360 achievements.  I guess having another system made me realize, oh yeah, this gamerscore number really means absolutely nothing after all.  I like that the Trophy system doesn't even try to trick you into thinking it means something to collect trophies.