Trout might get all the press, but I'd rather do battle with Smallies on a fly rod than just about anything.
Add to that carp, northern pike, pan fish, etc., the list goes on. People have been conditioned, based strictly on origins and image, to think of fly-fishing as a "trout thing" (steelhead/salmon) or a "saltwater flats thing". We have learned that it can be and is affective and fun with so many other species.