My DD just returned from the Doubletree in DTD. She went with 5 girlfriends and didn't have any complaints about the hotel. Here is a list of the bus schedule that she had:
MK-Epcot-MGM: Buses pick up at all DTD hotels and at Space #26 at each park, every 30 minutes from 1 hour prior to park opening until 2 hours after park closing.
AK: Buses pick up at all DTD hotels every 30 minutes from 1 hour prior to park opening and continuing through peak hours. Buses pick up at Space #26 every 60 minutes until 2 hours before closing. Every 30 minutes from 2 hours before closing until 2 hours after closing.
Blizzard Beach: From hotel 8:45, 9:45 and 1:45. From park 2:15, 4:15, 7:15 and 8:15.
Typhoon Lagoon: From hotel 8:45, 9:45 and 1:45. From park 2:30, 4:30, 7:30 and 8:30
Pleasure Island: Every 30 minutes from 6pm to 3am
DD's only wait was the return trip from the Animal Kingdom. They must have just missed the bus, because they waited nearly an hour for another one. Other than that, she was able to do a park in the morning and come back to the hotel for a snack and dip in the pool before heading back until closing.