They have CMs on that side to help people entering the monorail. I'm sure someone would say something if you tried to get off the wrong side, especially nowadays.I guess technically, it was a loophole in security. If someone wanted, they probably could have gotten off on the "enter" side of the monorail at EPCOT, then walked down the entrance ramp, and entered the park without going through security. I don't know how closely they monitored this.