I have seen people able to get in the front car at the monorail station going to Epcot. In fact, we were standing there, waiting patiently in order to ride in the front car, when I turned my back to say something to my dd, when another family crept into my place. It was too funny.....I guess I could have made a scene but it just wasn't worth it to me. I just turned and said..."Please, go right ahead. I'm sure your children will appreciate it ever so much more than my dd." They were a bit uncomfortable, but I walked away and got into the 'regular' line rather than wait for the next front car seat.
I actually had a friend try to tell me that only people staying at the GF were allowed to ride in the front car!! Of course this is the same woman that tells everyone what a terrific deal concierge at the GF is since they provide 5 meals a day. Anyone is allowed to ride up front...you may have to wait for a bit, but your turn will come. Just ask the CM who is working the monorail station you are at.