Based on my experience at the upper LeTort a couple of weeks ago, I'm starting to think that the small PA spring creeks are a really good place to learn to get good at bow-and-arrow casting. Not that I caught anything there, but at least I managed a few casts to targets and some usable drifts that I wasn't getting any other way.
I've started to see the potential of the bow-and-arrow cast, which I've hardly ever used before. If you're using a rod longer than 7', it's a lot easier if you hold the rod above the grip. Although it's much easier if you're using a rod that actually is 7' or less. It definitely takes some getting used to, since it bears no resemblance at all to conventional fly rod casting.
It isn't so much that the fish are especially smart on those spring creeks. It's that they're often so well-guarded, by the stream obstacles. It's like you have multiple alarm systems to crack.