The pro events could hand out a "vocab" guide for the newbies to understand the speak also.
Just to latch onto another point made earlier, the fact that it is repetitive can't be one of the factors inhibiting growth, There are many sports that are repetitive/"boring" that have great followings. Sports are about drama and the competition. We need to highlight those and promote, promote, promote. We need skiers to ski and be personalities, sponsors to sponsor, and promoters to promote. Promotion is about pulling the people in and having a great experience.
Given how good the pros are now, they should start thinking about a minimum starting rope length(to keep it moving) in pro events. You could argue that, with waterski it is the one sport that you actually are watching the athlete warm up during the competition itself which adds to the time the event takes.