When we went in January I couldn't decide between WL and AKL, so did a split stay. Disney makes it so easy. On the morning we were checking out of the WL we just called bell services and they came and got our luggage, they gave us a receipt for it, and told us it would be at the AKL by 3:00pm. We then caught a bus to AK, then AKL where it took just a few minutes to check in. Our room wasn't ready, but they gave us a room key and the number to call back later for our room number. We then went off to the parks. We called from the park for our room number and when we returned that night to the AKL we simply stopped by bell services to ask for our luggage to brought up. One of the bell hops said 'no probelm' and if we would wait just a minute he would be glad to walk us to our room. Within just a few minutes we were in our room, with our luggage, and alot of information about the AKL that he had given us.
I'm going back in three weeks and will be doing another split stay (POP x2nights, BWV x5nights, and then back to POP x2 nights). I'm going solo this trip, but have no concerns about switching resorts.