I have heard of people just showing up at the magical express desk at the airport and still getting a ride to their resort. I wouldn't recommend it but I know it has been done.
By the way I RECOMMEND collecting your OWN luggage and bringing it on the bus with you. Or at the very least packing a full carry-on bag complete with PJ's a bathing suit and a change of clothes for the next day. I've heard and experienced about luggage taking much longer than four or five hours to arrive at your hotel.