Been thinking about it too, as I currently have a boyfriend on crutches = living a very small part of the disability carer's lifestyle. I do need a car to get him to appointments (buses too bumpy), and am glad we have one (/shared car options).
What I don't need: to be able to get around the inner city super fast. The right to more time at traffic lights than pedestrians. The right to get places quicker than we would on a bus or a bicycle, in our dense local area.