Blimey.
I've seen a fair few 'people with disabilities? fuck 'em' threads on MN, but this one must come close to winning some sort of prize.
I do not think I have ever been in a shopping centre in late November/December where the wait for a lift has been less than 15 minutes. mostly because a lot of people are too lazy to use the stairs.
I had to use a buggy for longer than is usual (dd1 has severe ASD) so my 'couple of years' using a buggy turned into nearly 6. and even then, once we ditched the buggy and struggled with walking, dd1 was phobic of escalators. and so we had to use the lift.
in her short life (she is 7), we have lived in 4 different areas, and so have experineced a fair few different shopping centres. we have always had to wait for ages to get in - the doors opening, lots of people gazing at us interestedly, as though we are a pleasant diversion for a few seconds before they continue on up/down.
dh has, at times, been moved to ask if anyone could vacate for us. I would say that on average this has about a 20% success rate (although maybe it was due to the fact that people thought we were not 'in need' as 'just' had a buggy. although dd1 was a very tall 6, and usually quite distressed by the time he asked, so fairly obvious that she was not NT, if you ask me)
now that she is no longer in a buggy, we use the stairs, if they are not located right next to the (to her) terrifying escalators. on a good day, we can get her to walk past the escalator and use the stairs, but not always. and so we continue to queue for lifts that are usually full of people who have no absolute need of them. because taking a 10 second detour is so fucking hard for some people.