Normally at a loading, unloading station, multiple cabins are loading at the same time. It takes about 20-30 seconds for a cabin to go around the loading loop and a loading platform holds about 3 or 4. That is at least the way it's done by skiing. having only one avail to load at a time, will slow things down. But knowing Disney's anal retentive safety policies I can see them waiting for the doors for the one cabin closed and ready to launch before anyone gets in the next available one that has been sitting there with open doors to load for 20 seconds.. the whole loading process is fluid, where in NORMAL circumstances you have multiple cabins loading/unloading at the same time.
The links shows a loading platform. Keep in mind the loading is dead (no riders) but if you notice all the open door gondolas. Open door means hop in.. In normally rider traffic, all gondolas would have been loaded at the same time, so when the camera turns from that guy, the gondolas behind him would have been full or loading . Same thing with exiting.. once the gondolas turns on the platform all hop off. In most systems 3 or 4 gondolas fit the same time on a loading platform. they are scrunched while loading together; while on the line is when you have the distance between them.
oh I have been on about 15 different Austrian gondola lines.. Never been on one that fits 10.. standard is 8... Unless you have a different system that holds masses.. Like the Zugspitz. that one holds 20 or 30 but the line only has 2 gondolas. and standing room only. totally different system.