I have a family member, my mother, who is in a wheelchair and we have little issue assisting her onto most rides and experiences. She only has one leg. But again, we transfer and assist. As a family, we are consistently appalled at the number of people at WDW claiming disabilities and riding around on massive scooters. They take over a bus, and little kids wait in the rain for the next bus because Jumbo took three seats and standing room for four more for their power
scooter. But watch Jumbo step off the scooter when something doesn't accommodate them. I applaud Disney's plan for transfers rather than accommodating the ever exploding scooter population in this new land, as does my mother, wheelchair bound. (We use the monorail when we can and otherwise bypass the bus system at WDW and call for a taxi so as to get where we are going faster; again the line of Jumbos waiting for the bus usually takes the space for a wheelchair. We also don't want to tie up the world loading, but that's just us.) We've never found any place as reasonable or accommodating as WDW for true disabilities, but life is a balance and we don't want to ruin everyone else's experience. If people would be more reasonable, less demanding, and less self-centered, I think you'll find accommodation abounds. Just my two cents.