Love Monkey- to clarify, I"ve been told that you don't necessarily go "straight to the front of the line" but get a pass that can allow you quicker boarding, or allows for special needs, such as using the elevator instead of stairs, or lets the cm know that you need extra time to get on or off the rides. Universal offers a similar thing. We had considered purchasing extra days at wdw, but now have decided instead to spend a whole day at GKTW, since this will allow us time to relax,and just play together. we also don't want to miss out on the experience of gktw. you will also receive one day passes for seaworld.
hope this helps!