I've usually been advised to go through the body scanner but I think the regular metal detector would be ok too, I'd just turn your SCS off before you go through, because my reps have said that metal detectors like that can sometimes reset the programming if you leave it on And you can tell one of the security guards when you're going through too that you have a medical device. I've brought my card to show them but I don't think it really matters that much- they believe you. And your you can keep your SCS on during the flight, thankfully.

Disney does have motorized scooters you can rent and many guests do. Hope you have a fantastic trip, Disney World is a wonderfully happy place!