I use a
scooter at the parks. I actually have one delivered to whichever resort I stay at. It is easy enough to avoid having to walk from the parking lots by doing the same. I know at least one service rents scooters that you can take apart and transport in your own vehicle. Or you could use a Minnie Van, and they are ones that take scooters too. Even more simply, use Disney transportation that will drop you off right at the park.
All I'm trying to do is point out there are many ways to avoid the hike from the parking lot. Which is probably at least part of the reason they are not in a hurry. People with medical issues (like me) can avoid the walks from the parking lot, with some planning.