There never seem to be enough ADA spaces at M&F/PP, although if you arrive early you have a better chance of getting one.
There are some spaces on all levels of M&F but they usually seem to fill up quickly. If you have your placard hanging, the CM who is directing traffic will send you to the front rows, if there is room there, so you can hopefully park closer even if it's not an actual ADA space. It's gonna be a bit of a walk, even if you manage to snag one of the ADA spots - to the elevator/escalator and then to bag check, then to the tram.
In PP, all the ADA spaces are on the ground floor. If you get one of those, the walk is also not super close - you have to walk over by the elevators and then around the front (or perhaps up a level and then down the escalators...the signage seems to be different sometimes).
I haven't parked at Toy Story, but it sounds like that might be a better choice.