I've had it go both ways. If you can sit in a spot that will help you get out of there in the front of hte pack, possibly even leaving when the ferry boat of characters is happening you have a much better chance to be on one of the first buses to mk and lots of time to find a spot especially if you go through emporium, and then go directly into the old fastpass area in front of casey's.
It's going to depend on transportation and how many are going to hop over at the same time. The key is to be on one of the first buses.