Ok,
Universal offers 2 forms of Express, the " normal " free one, where you basicly have one at a time, and a $25 dollar fee one that allows you to ride each Express attraction one time at anytime you wish. IF you are an Universal resort guest you are given unlimited Express passes.
I am not a huge fan of Universal Studios. I like some things at Islands of Adventure and would problay go to that park everytime I come down to FL, but the Studios are a pain to me.
The waits there are almost insane, and the attractions in my opinion are not even close to anything offered at Disney / Islands of Adventure. Add to the fact how large and spread out that park is and you create a lot of frustration.
I say all this because when I just went I was with a 1st timer that had not been to any parks before so she insisted on going to the Studios. I bought the Express Plus passes just to get in and out fast. If that is your goal, then I highly suggest the Plus pass. You just go in a clockwise circle and use it at each major attraction, and your out in half a day.
Universal uses Express passes at almost every attraction they have. I notice even with a Express pass you tend to wait longer than a Disney Fastpass, probaly about the same when you have to go through a Disney preshow, Rock N. roller Coaster, tower of Terror Etc... but nothing out of control. Maybe 15 minutes.
I hope this explains it for anyone who had questions.
Joel