Unless things have changed in the last year (very possible) this is how it would work...
Early morning they would direct you to park on the outside lot, then slowly open up each level of the Mickey Parking garage. By the time we would leave around noon, then come back around 5 we almost always were told to park on the highest levels because the lower levels were all filled up. Not a biggie since they have escalators though.
So I had to keep track of multiple parking spots a day

When you are there for a week it's easy to get confused, which is why i would take a photo each time.