Sorry, no. I get motion sick and, therefore, I can't ride many of the attractions. If someone get panic attacks in lines, they just can't ride. Sorry. Get some medication, get a GAC.
Since you get a GAC, I am sure you are aware that not every ride is able to accomodate GACs. For those attractions, I have heard Disney CMs tell several people to have two people sit and wait while the rest of their party waits in line and to join in closer to the front of the line.
Saying they cannot ride is not acceptable and I honestly find it hard to believe that anyone who truly needs a GAC would think that it is.
Luckily I do not have this issue myself, but I have seen numerous people who do and honestly, I would rather see them wait in a safe area and then join their party than have them in front of me and have a panic attack. I have seen what can happen during a panic attack to people that have them and it can make for a dangerous situation for them and those near them.
My point was that this is within Disney's rules, both guest relations and CMs at various attractions have confirmed this over the years. Yes, they should get a GAC and this would indeed be limited to those attractions where the GAC cannot be accommodated, which is rare, but does happen.
It is truly sad that people feel that those with disabilities should be excluded from certain activities just because there is no set way to accomodate their disability, even when there is a possible solution just because it is outside the norm of what people think is acceptable.
As a result, I would say that you shouldn't judge in general, of course if 15 people are joining their party that is now at the front of the line, I might say something about that.