Well, they (WDW) say that the busses will run for 1 hour past park closing. But I have heard that they run until the park is empty. I do know that once when DD and I closed down the MK at 2 am and we were leaving the park slowly so it was after 2:30 am, a CM near the exit asked if we were using the busses and I said yes. they asked which resort and then radioed to someone to tell them that there were more guests coming out and that they were staying at POP. The bus only had a handful of people on it, so I guess they kept it waiting instead of making another run. Had a similar situation at Hollywood Studios (only it was MGM then

) where busses ran for more than an hour past park closing. It wasn't as late as MK. but a CM radioing busses in, stated that they will keep them going until the last guest is out of the park and on their way to their hotel. I guess if they see you headed towards the busses, they figure you're staying on property.
Worst case, if you have to, take the bus from the GF to DTD, shop, and then take the bus back to your resort.

Kill two birds w/ one stone.

which makes me think of a funny story. Years ago, we had eaten a late dinner at Ohana. IT was the only ADR time I could get. Well we figured that we'd have to do the DTD switcharoo due to the lateness of the hour. Well, when we left the Poly, the driver was looking at us like you want to go to DTD when it's closing in less than 1/2 hour?!

Well, we were the only 4 on the bus and he asked politely why would we want to go to DTD at this late hour? Well, we looked at each other and DH said "Oh my! We must've gotten on the wrong bus! We thought that this was the express bus to POP Century Resort. That's where we are staying." At first the driver thought we were serious, but then realized what we were planning on doing. Being the nice guy that he was, he shut his light thingy off and radioed in that he was taking some guests back to their hotel. what a nice guy and what a great treat at that late hour with such full bellies. We did give him a nice tip though for being so kind. I love when the CMs do magical things.
