Actually, the resort buses DON'T go to the TTC. This has always been a bit confusing because you would think that all buses would run through the transportation center. Resort buses don't, except for buses to Fort Wilderness, WL and the Contemporary. The TTC is a hub for getting from park to park, not resort to resort.
Buses run to the resorts from each theme park until an hour after that park closes. And they run from Pleasure Island until 2:00 am.