Please do not make me responsible for other peoples children.
I think the single rider line is an excellent idea. As this ride accommodates 6 and we are a family of 4 it was great to have single riders. It gave a second option when standby line is to long.
However, we where at the Disney resort for over a week and had several young children who did not understand the single rider concept placed with us.
The loading process of this ride does move rather quickly. We were given a single rider boy of about 8 who kept climbing the railing, his Mom was about 3 cars away. Then when we loaded the vehicle he stayed on the platform. We tried to coax him into the empty seat next to me, but he just looked at us like we were strangers and he was not getting in with us. He then stayed on the platform making the next group of 3 call over a CM because they were now a group of 4.
On another occasion we saw a young girl (not in our car) burst into to tears because she was not ridding with her parents.
I think the single rider line is awesome just wish they could implement an age limit.