We used to be able to get one for each of my kids. DS1 is autistic with medical issues and DS2 is diabetic with other medical issues. We used to be able to get one for both but when we were there in December I was told that they are giving them only to guests with cognitive issues so DS2 isn't eligible anymore. I imagine it is probably because so many of the queues are more ECV and wheelchair friendly. Certainly doesn't hurt to ask though.
This time of year though crowded are pretty low and you will probably find minimal waits anyway. Just take it easy. Have a great time!