It should be be mentioned that the shops won't let you in once the park close hours hit. So if there is something you need to get, make sure you're inside the shop prior to the closing hour. Now, they won't kick you out of the store just because closing hours have been reached, but you can't enter (even if your party is inside).
In Epcot, walking from the front of the park to the back to return to Boardwalk or Beachclub is kind of neat after the park closes. It's completely empty in the Int. Showcase area but still illuminated. Very pretty and a bit eerie even.