Has anyone used the Emerald Aisle at National Car Rental? I'm just wondering if it is really as easy as just walking to the aisle and picking up your car or if they are frequently out of the type of car you reserved. Also, I just want to verify that at MCO, you just cross the street from where you pick up your luggage and National is right there. I don't want to have to take a shuttle to pick up the car. Thank you!!