Casting to rising fish is fun, there is no doubt of that, but casting to where the fish may be holding, though no fish is seen, is stimulating as well. Sometimes it takes a dozen casts to bring the trout up to the surface...sometimes you're casting to empty water. And you may never know which it is; you may have put the fish down on the third cast.
I hitchhiked out to Montana in the 60's to fish the Yellowstone River. It was big water and there were some big fish but there wasn't the structure or variety of water that I was accustomed to...it's one man's meat...