RC airplanes have been around my entire life. They have a place. Drones will too. While completely illegal, white noise generators will pretty much ground a drone.
While RC planes have been around for a long time, very few of them have cameras. Not only does this mean that one tends to fly them in place where one has long open line of sight, but one flying overhead is primarily a noise issue, not a privacy one. Plus, the move on, not hover. A drone with a reasonable camera completely changes the expectation of privacy.