The Universal Guest Services employees may start up on their usual spiel of "all of our rides except Back to the Future are ADA accessible and won't required any assistance".
That's the same thing we were told the last time we were at Universal, which is why we have not been there in many years - except that Back to the Future was considered to be an accessible line and we waited in the line for over an hour, I think in along ramp. For someone who has no needs other than the lines to be accessible for their wheelchair, it might be a fairly accessible park. But, for anyone who has needs
in addition to using a wheelchair, we found them not to be very welcoming. At Guest Services, we were basically told that if we needed to wait out of the sun, we should avoid lines that were in the sun. Some individual CMs tried to be helpful, but their policy was that a line a wheelchair could roll in was all the ADA required and was all they needed to provide. That's why we haven't been back there in many years.
In defense of Universal, WDW Guest Services told us the same thing in 1998, when standard lines were just starting to be made into Mainstream (totally wheelchair accessible). But individual CMs were still helpful, tried to find us a suitable place to wait and several CMs told us about GACs and gave us their name and station and told us to have Guest Services contact them if they did not feel we needed a GAC, because
they could see what problems we had in line. By late 1999, the Guest Services people were also on the same page: "Our lines have beeen made wheelchair accessible, but we realize for some people that is not enough."
I have read that people with autism have no problem getting the Universal/IOA equivilent of a GAC (but as Absimilliard noted, I have heard they sometimes ask for proof of a disability, which is not allowed by the ADA).