Lord_Vader
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I do a bid of reading on the Dis disability forums, The mod there Sue is a expert on the ADA and it has been noted by her and others it is the law!. You are not allowed to ask for documentation. You cannot even ask what a person disability is, you can only ask what assistance do you need.
Year ago we had Mom in a wheelchair (this was before ECV were popular) this is what Guest services did.
I do agree Disney is likely happy they don't have to let CM make those types of GAC rulings. CM's can deny a person a GAC if their needs for assistance does not warrant it.
Today if you have only a mobility problem, you won't get a GAC, you are told you need to use a wheelchair or EVC. The wheelchairs and ecv's can go though all the lines, either mainstream or alternate.
AKK
I did not intend to imply that Disney can or should ask for documentation, only that they are risk averse and do not want to be seen as possibly breaking the ADA law.