I recognize that there are disabilities that people can't see, but it seems that the number of scooters has increased drastically.
I'm just going to be blunt about it. The usage seems to have ballooned due to America's obesity epidemic and overweight/out of shape people who are simply physically unable or just unwilling to do the walking required at Disney parks.
And to preempt the inevitable "they might have endocrine problems/unseen disabilities" types of replies... Yes, maybe some of them do, but we all know that America's weight crisis has to do with poor food choices and lack of activity, not because of an exponential increase in glandular problems.