Maybe the cold water quiets things down?
Thats one advantage of cold water diving is the vis is usually really good. I did my ice diving class many years ago in Lake Placid, NY and the vis was like 20 feet, I could see my tether line clear back to the hole.
Never thought about the boat ramp in CT, I've done training at Finns Beach for the local fire departments but it was surface stuff and ice rescue. I'll have to give it a shot.