You will get a variety of opinions on this topic. We definitely did not like moving from AKL to the Poly last summer. We spent four days at each resort, and I really did not think we had enough time to enjoy each of the resorts offerings. We loved both resorts, but would have prefered to have stayed at either one, for the entire eight nights. Especially the Poly....There is just so much to do there...
Some people love to split a WDW stay....They feel it is like getting two vacations in one! We just did not like the unpacking, repacking and unpacking homeless for the day situation. It was like we missed a vacation day dealing with the move. And, of course, I always have room requests so the room is never ready early.
Enjoy planning your vacation!