I really hate the angst that arises from someone "floating" a stream. Why not just let them pass, relax a while, and start fishing again? I think that the alleged "disturbance" is very short-lived. For the floaters, if possible, find a route downstream that disturbs as few wading anglers as possible. If advisable on common-sense grounds, and feasible, pull up to the shore and quietly go around wading anglers. Not every angler, but if a pod of anglers are working risers, I would think common courtesy might dictate interrupting your float, if needed.
In any case, no matter the size and popularity, if I desired to float a stream/river, I would simply put on my best chagrin, wave and apologize as I move through, then fugetabouotit.