personally i think the noise is more angler related, generally we like to sit there in peace and quiet, theres a thing called spodding in carp fishing were you load up a container with bait and heave it via a rod, i watched a lad the other week on the pit were i fish heave 20 spod fulls of bait in, bloody big splash as it lands, i had the boat with me and put my groundbait plus hook bait about 25 yards down the bank under a big overhanging tree ( no way i could cast under it) , then another about 30 yards out on a ridge, i used the fish finder/sonar to locate the ridge, later in the day one the guys came around for a natter, he noticed the boat and said oh those things cause too much disturbance, at this i replied what about spodding ??, to prove the point the guy across the pit again heaved in a load of bait via a spod, more like mini depth charges, to show the guy i put a bit more bait over the ridge with the boat, he had to agree the boat created less disturbance, so then he hit another tack, using a boats cheating, so i replied so is using a rod, a reel and a bite alarm, then it got down to price, which i think is the main bone of contention, that plus people using them to fish at excessive range/against snags/driving them through other guys swims, for me personally its a tool, i have a damaged back from a cliff fall, distance casting, excessive casting ( spodding) casting from funny angles to get under trees etc cause me pain, the boat means i dont have to worry about setting my damaged back off
as i have said your not running these things at speed, so the turbulence is not there, obviously anything big floating over a fish will create predator panic, but like with my labrador - free food soon has them back