A perfect example is the Kilimanjaro Safari ride. We made the mistake of not using the GAC and instead went through the standard queue (it was only a 15 minute wait) but after waiting in line, we then were pulled out to go to the disability line which took forever due to very few wheelchair accessible vehicles. BTW, not one of the wheelchair bound "disabled" rode in their wheelchair like our child did but was able to transfer flawlessly. You could hear a lot of them complaining how long it took and how they should have gone through the regular queue.
This was us, sort of. We had a wheelchair with us last week because my mother (76 years old) gets tired, and also doesn't ride a lot of the Big rides so spends a good amount of time sitting, waiting, for me and the kids- it's awesomely nice to be able to set up a place to sit in the shade no matter what the bench/shade situation is. So, we went to use our FP+ on the Safari- we were looking for a place to park the wheelchair but they were all, oh, no! you can take it right through the FP line and park it really close! So, uh, ok. We're new, what do we know? We go through the line and there's the stroller parking along the way but *oh no*, we can't put a wheelchair there, and are instead directed through to the alternate access line which takes... a long time. :-/ We didn't really complain about it, but did commiserate with others in the line- there was a group of about 9 at the front, with a single wheelchair, and then various people behind. There was a couple who were using an ECV- the wife actually needed it because she can't walk for long, but also can't sit for long, so she would use it, then they'd have to swap out so she could walk and her husband would have to drive the ECV since you can't push the things (a clear downside to ECVs for those of us with partial issues- my mom doesn't want NO walking, she just *sometimes* needs to be not walking; likewise, my asthma and leg pains put me in the chair for various periods of the days, but I'm not going to give in to my lungs and just drive- my only chance of getting better is to exercise). We were all a little disgruntled with the situation, I guess- middle of a hot, sticky day, and a longish wait on a day when the waits were not generally long.
We
never intended to use the wheelchair to get us into or around any lines, so it was a surprise to find ourselves in the disability line for the Safaris, waiting significantly longer than we'd expected with the FP+. It was what it was, though, and it was still a fantastic, fun ride!
I deeply hope that the new system is not the falling sky that some are worried about, and I have confidence that Disney will iron out kinks to truly help the wide variety of people with disabilities who have so loved coming to the parks because of how well they are generally treated. My friends with kids with autism are certainly watching carefully.