It's such a hassle to go from DTD to the resorts, as all the resorts I've stayed at do not have a dedicated DTD bus - it tends to stop at a water park as well, and go to all 3 DTD regions for pick-up, etc. Also, the buses just don't seem to make that DTD trip all very often!
We've had to wait 45 minutes for a DTD bus to take us back to our resort, the longest of any WDW bus wait for us!