We are also in Windermere. If you are leaving the MK parking lot when you are coming along the front of the Richard Petty driving you will see a sign that says exit and shows that you keep to the left...if you turn to the right just past that sign you will drive through some more of the parking lot and then exit to the right onto Grand Floridian Way and then you can return back to Windermere that way or go in front of the Poly and turn left at the corner and come back past the Contemporary. It's sooo much easier than going the opposite way to get home.
I know this doesn't make sense but try and google map it or keep an eye as you are leaving and you will get it figured out. If you go to MK that way also look as you are going to MK and you will see that exit as you travel the road and it will be easier to find when you leave. As a FYI when you leave the actual parking lot you will be going out an armed gate that will rise when you reach it.
Liz