we ate there last year and will say it is more convenient to have part of you party sit in a car right next to you rather than all in the same car. All in the same car you can only talk to the people directly behind or in front of you. And that even requires the front person to turn around. The front and very back people are not able to communicate well at all. Now if someone is beside you in another car...conversing is much easier. We have 8 children and it was hard to get everyone's orders, cut their food etc.
ANother thing to note about the cars is that they are quite tiny. The space between you and the table is small. We are not big people so it wasn't uncomfortable but I thought it could be uncomfortable for a lot of people. I did have a newborn and it was pretty impossible to try to breastfeed while eating. Not enough room to have an infant cradled in your arms with the table so close. I had to turn my legs to the outside of the table in order to accomplish this. Just a few thoughts for anyone planning on visiting here in the future.
One more thing, milkshakes could be substituted for your fountain drink here on the dining plan. However, NOT for anyone on the kids menu. We asked at check in if we could get milkshakes instead of the drink and they said yes but never mentioned not the children. They all planned on getting them and our server told us the children could not. Well there were a whole lot of tears and dissappointed children then! Those of us on the disney adult menus got them and we all shared, however, it would have been nice to know prior to ordering.