I stayed at WL and was quite frustrated with the transportation. I am disabled, walk with a cane, don't use a wheelchair. I was told I could take the launch to Contemporary, however, it involved a step down that I couldn't negoitate and it (the launch) was unsteady and rolled in the water. I think an able-bodied person would have a difficult time with it! I used the buses for transportation but found their schedule to be frustrating ,unpredictable and took a long time to get from point to point. We ended up taking taxis just to get around and not spend all day doing so!
When we stayed at the Polynesian and had access to the monorail it worked out so much better. That was our best trip, we weren't fighting the logistics of getting around. When you include what we paid for taxis while staying at the WL, the Poly was actually cheaper. IMO, the WL is just too frustrating transportation-wise for anyone with a mobility impairment.