They are definitely going to ask. When I was there in July everytime we went through I got asked for ID. Howevever, a little fun story, we had two seperate rental cars when we went down last March. It was my father's birthday and he was in the car behind ours. Each day I would ask the cast member in the toll booth to wish my father a happy birthday and each time the cast member did and gave him FREE PARKING. It's probably a coincidence that it happened all 6 days but it was a pretty cool little perk.