Didn't make any difference to me last year. There was only me and my grandaughter in the car. At every peage I had to get out the car walk to the kiosk, get a strange look from the person until they realised there was no one in the front seat.
I know what your going to ask "why didn't you get your grandaughter to do it"?
She is under 10 years and not allowed in the front seat, and there was no space to pull the car forward so she could do it from the back.
Luckily they were all manned, not sure how it would have worked on an automatic one.