(a) General rule
"No individual shall be discriminated against on the basis of disability in the full and equal enjoyment of the goods, services, facilities, privileges, advantages, or accommodations of any place of public accommodation by any person who owns, leases (or leases to), or operates a place of public accommodation."
This clearly states that a person with a disability should receive equal treatment in a place of public accommodation to the extent that a person without a disability should receive. If a purpose of a theme park (other than making money) is to allow guests to queue for an attraction of their choice and participate in an a attraction of their choice, then I would believe that making every queue line, pathway and handicap accessible vehicle accommodating for an individual fulfilling of the law. If a guest with a disability has the opportunity to ride the same attraction, and wait in the same area, then the GAC card is (almost) irrelevant, because disabled guests are not being DENIED the opportunity to participate in equal activities.
Also:
For purposes of paragraph (1)(C):
"(A) An individual meets the requirement of being regarded as having such an impairment if the individual establishes that he or she has been subjected to an action prohibited under this chapter because of an actual or perceived physical or mental impairment whether or not the impairment limits or is perceived to limit a major life activity."
"(B) Paragraph (1)(C) shall not apply to impairments that are transitory and minor. A transitory impairment is an impairment with an actual or expected duration of 6 months or less."
If a person claims of having a disability, it must be something that has a permanent effect on their life. The ADA does not account for people with any short-term medical conditions and as such, Disney has no obligation to accommodate anything that is a short term impairment or any person traveling with a disabled individual. ADA is only accountable for permanently impaired individuals. Therefore, if a person has a permanent disability, then it should be documented by somebody from the medical field and account for the person's inability to perform specific lifestyle functions.