As you can see from these varied responses, FtW is the most "inaccessable by direct route" place, in and out, in all of WDW.
I'll tell you something that most guests don't know.
There is ONE park with a direct bus to and from the Pioneer Hall area (Crockett Inn, Trails End, etc.)
Its MGM.
If you want to get to Pioneer Hall and you are near MGM (during MGM operating hours) that is the most direct route (even better than taking a taxi or driving.) The bus drives straight to the nearby bus stop for Pioneer Hall.
From MK area, take a boat. From MGM area, take that FtW bus.
But at NIGHT (after all the parks have been closed for a while) the sad truth is, if you want to take WDW transportation from FtW, you'll have to first go to DTD, exit and then board the bus marked for your resort. All the other buses and boats will likely have stopped running by then.