We discovered the shuttle during a huge downpour, after being kicked out from under the boat shelter twice ("kicked out" means they did it rudely, without any information being imparted to us until AFTER the second time) and finally being told there was a shuttle. Of course, the info is in the checkin material, but even I don't always go through that, being so excited to just get going with the FUN!
when there is a downpour and lightning in the area, the TMs will rush you away from the boat dock for your protection.
the last place you want to be in an electrical storm (on the way) is at the boat dock.
that's not being rude, it's trying to get everyone to safety as asap.
they're just doing their job.
if some guests won't move, they will have to insist to clear that area.
they don't want anyone to get fried.