You don't miss much on Kongfrontation, in fact that route is the way we took when my son was in a wheelchair on one trip. There is a queue but no real preshow, besides the tv news clips which from what I remember are also back near the elevator.
I did miss the Hulk's queue, but managed to see it finally on the day we got in on EE, when the wait time was Zero! It was interesting but I'm more of a ride person, so the queue and the pre-show is no loss for me.
From what I remember you miss nothing on Spiderman, half of Dueling Dragons, none of BTTF, JPRA, CITH, Storm's Teacups (JK), Alfred Hitchcock, Nickelodeon's tour, Jaws, T2 and when you come in from the side door of Hanna Barbera you walk in on the preshow. I'm sure I missed something but this was what I remember from May's trip.
Hope that helps!