Eddie, I agree with you on overlining rods for the short casts needed on small streams. Some streams I fish get enough pressure that a lighter weight rod allows you to have a more flexible spring when you do hook up with 7 or 8X. At least thats the theory I used to justify building a 3 wt (actually it'd be better as a 2 wt) last spring.
Art B has an article in the forum discussing his experiences with a 2 wt for trout. Its an interesting read.