Just the other day I ran into a guy on the river that was having a blast. He said he was a hard core fly fisherman that had just discovered the joy of spin fishing for trout. He was amazed at how many more fish he was catching.
I agree 100%, you can catch more with a spinning rod and a lure. I'm not a hunter, but I put fly fishing in the same category as hunting with a pistol or bow. It's the challenge of using fur and feathers to convince a pretty picky fish that this is actually an insect/ food.