Hyatt's advantage is location and the special baggage service.
Hyatts disadvantage is it's about twice as expensive as the dozen or so hotels just off the airport property (5 minutes by free shuttle).
We got in at 11:30 pm, stayed at the Sheraton just off the airport. Shuttle picked us up at the airport, and dropped us off the next morning at the Disney buses.
The savings over the Hyatt were within a few dollars of our total bar tab for the week.