I love them too!
When I first moved to Vermont I got into them when I was going for Salmon and "steelhead"(lake-run rainbows). I had little luck with those fish at first, but I kept getting bronzebacks. Now I spend most of spring and early summer going for them. People don't realize how quick they are to take a fly. I regularly do better with flies than others throwing hardware/plastic.
I basically have three, very simple patterns - deep minnow, wooly bugger, and a crayfish.
When they get big they really know how to fight, too. They usually get airborne.