The DHS is awful with the crowded bus station between the handicap parking and the entrance.
Epcot is a long drive but it's nicely landscaped although a bit cramp.
Universal is much better. Because of the moving walkways there is at least ample space to manoeuvre my wheelchair.
The closest you can get to the entrance is Sea World. Only the busses to cross but that one is much better positioned and less crowded.
I always take the boat going to Magic Kingdom anyway. It is a much nicer way to start your day than the overcrowded Monorail.