I have under a year on the line and I usually switch the bleeds during my parking flow but most captains will see ground power and the APU will get shut down in the same thought. It is almost muscle memory now for every captain I fly with. I might say something and the response is usually "they are usually pretty good about ground air here." I am afraid if we continue to leave people on hot airplanes with bad or no ground air they will start requiring us to stay until the last passenger is off.