I think there are alot of anglers out there that hate speyfishing because they don't understand it, and it's fairly new.
It also requires anglers who are set in their ways to behave differently, as spey fishers require 20 feet of space above them, and 40-60 feet below them, so they can perform the cast.
Here is what is going on under the hood when you see someone flinging the spey rod out there...
The first part of the cast is the roll cast which gets the heavy weighted tip on the surface. The rest of the cast shoots the line, sometimes off the upstream shoulder, and sometimes off the downstream shoulder. This depends of the side of the river then angler is casting on, and also what way the wind is blowing.
Once the line is out and the fly is fishing, the angler is ideally working the fly a foot or so off the bottom, which is done by raising and lowering your rod tip. This also controls the speed of the fly as well, the slower it goes the better chance fish have to take a look at it and react. When they hit the fly, the take can be savage, or it can come to a simple and abrupt stop.
Sometimes, the fish can toy with the fly through the swing, and the adrenalin rush when that happens is extreme!! You have to play it cool, and allow the fish to take the fly, you can't set the hook. You can feel it as the fish plays with the fly, much like a cat swatting a ball of string... When a fish does this to me and I miss it, I literally shake the rush is so intense.
Another thing that you will notice is that Spey fishers stand further out in the water... This is also fundemental to the cast, as the line must be in contact with the water during the cast. Also, twigs and debris on the gravel bar behind can foul up your cast.
It's also essential to allow the heavy weighted tip to work the shallower water at the end of the cast, the angler uses the water hydraulics to allow the line to remain suspended. This also creates the need to be farther out.
This being said, I hooked more than one steelhead on gear behind spey guys last year, 10 minutes after they left the run, right where they were standing. The steelhead naturally settle back in where the water is best.
Anyhow, that is my two cents, I hope I've helped someone out there understand speyfishing a little better
Feel free to ask whatever questions you like, and maybe there are some other elements that I have missed so feel free to chime in...
Cheers,
Nicole