To keep things moving as quickly as possible at the TTC to get people to the park. Yes they use opposite sides, but it adds extra station time to open the doors, wait for people get on the train, and close the doors. Adds even more time if some of those people are in wheelchairs. Since there aren’t that many people leaving that early in the day, it’s far more efficient to have those exiting guests use the Resort line.I could understand it for the ferry but why are they doing it for the monorail? The express line uses one door for unloading and the opposite side for loading at both stations.