Well unfortunately my brother is not only physically handicapped, he's also severly mentally handicapped. He can become really impatient, and won't understand why he has to sit in a line for long periods of time. It's not something you can explain to him. Imagine a 2 year old, only he's 250 pounds and is 6'2". Pushing him in the chair isn't exactly an easy thing either, but he could never know how to operate an electric one. You find out just how many uphill slopes DL has when pushing a heavy person in a wheelchair!
Personally it NEVER bothers me when a disabled person just goes through the exit. For me I feel lucky that I CAN stand in that line, so I don't view it as being unfair to me.
Now if I just had a hurt foot, or some other minor injury, I wouldn't mind going through the line with an electric chair at all. But our situation is a little bit different then that, and I think those that have been so robbed of a normal life deserve that special treatment at DL.