Not quite. All the regular lines at Universal are wheelchair accessible, and biding by ADA laws, we cannot treat anyone differently if they are in a wheelchair. So if they do not have a pass from guest services, then they will be going through the normal line.
If you are traveling with a wheelchair, go to guest services and explain your situation, and they will print you out passes they seem to be fit. Present them to the greeter at each attraction and they'll tell you where to go.