If you are changing to GF for other reasons that’s one thing but not if you are running from bedbugs. You are as likely to find those at GF as the Poly. Still check your room.
I’m a hotelier and can tell you that bedbugs come into most hotels on guests luggage and personal effects. If a bag sits next to an infested one anywhere during travel the bedbugs can get on that bage and come to the hotel. The guest before you or before that likely will have brought them. And yours could have picked them up so check your bags when you arrive at the hotel.
So, don’t fool yourself into thinking that by changing your hotel you have removed or reduced the risk. You still have to be concerned and check your room on arrival. What you really want is a hotel that does things right if they are found and there Disney is one of the best and at all of their hotels.