They did exactly that for us at Pop Century. We checked in early Sunday (rooms weren't ready yet), checked bags, left for Epcot, returned around 11 pm to our rooms (with the baggage there) to find they were not in the building we requested. Requested to move, they said leave our bags by the front door and they will move them next day. Next morning, we left early for MGM, returned around 10 pm to new rooms and all our baggage already delivered! The only thing they didn't leave was the case of beer, which they delivered after we called.
I didn't think it was a lot to ask...