We've all seen the catch phrase: "Fed fish are big fish", but the unwritten other half of that statement could be "Fed fish can be hard to catch fish"
I absolutely think our fish are harder to catch since implementing a feeding program. It just makes sense to me that they would be. And once you factor in a policy of catch and release combined with the feeding program, the fish get pretty tight-lipped.
Hence the popularity of pellet flies, and Stubby Steve's.