We did a split stay, once, cured us, not to our liking. We split 3/7 AKL and the Poly. First off, never stayed at AKL and after one day didn't care for the resort or location. We lived out of our suitcases until the switch morning and went down early to get on with our real vacation, the Poly. We rely on Disney transportation and took our stuff to bell services along with our beverages and groceries, nothing was said and we took the bus figuring our stuff would arrive after we checked in the Poly, not. When at the Poly, room not ready and were told luggage would not arrive until after 3 pm. Now were resort less and room less and not stuff. If we had known we would have kept a small bag for swimming and some drinks. Move on to later in the day, 2:30 no room or baggage, 5 pm still no room, finally complaining we're losing a day in this transition at 6 pm a manager comes to us and gives us our room keys, an apology and bumps us up to concierge for the remaining 7 days because of the wait we had, wonderful but our luggage doesn't arrive until 7 pm. Do another split, no thanks, we're not interested in other resorts, know where we want to stay, that trip we couldn't get all 10 nights at the Poly so opted for the first 3 at AKL, just to see, and give the split a shot.
I know others love 2 different resorts, but we like unloading our stuff and moving in for the duration and arranging the room for our needs. Heading to a park during a split and not knowing if you'll have a room ready or not is not very pleasing when you're hot, tired and sweaty and we enjoy afternoon pool breaks but when your luggage is in limbo and no room, it makes for unpleasant vacations. Nope, we'll stick to the one resort vacations and be happy where we pick and let others enjoy splitting reservations.