Talking rivers and streams here...
IMHO, sleds are all that and more. Just doesn't seem to fit with my image of flyfishing. It's kind of like hunting from a moving truck and unsportsman like; to both the quarry and fellow fishers. I've seen way too many fishermen driven from their run when the fish are put down by sleds powering upriver. Driftboats, rafts, etc., are okay as long as there is no motorized propulsion.
Ban all boats - nah. You know, I've been thinking lately about all the redds that are being trampled by the wading fishers - not too cool either. When the State closes down all but a few streams the pressure on those remaining open becomes extreme. Thankfully my homewaters, the Skagit, is large and not easily waded in many areas. I recall hearing somewhere that the middle reaches of this river was having problems with poor spawning success. This same stretch is also where most of the pressure is focused early in the runs. Coincidence? I don't know. Yeah, considering the alternatives, I can live with driftboats, I guess.
...just a couple pennies worth.