I have discovered this neat little trick while with my friend in naxx 10.
This will probably work only for hunters (or somebody who can control their pets, Warlock maybe? did not test)
We pulled gothik but we both ended on one side of the fence, except for my pet. It is easy, just run past the gate at the last second or have you pet on stay on the other side. When the first living adds spawn, they will not have any aggro whatsoever, but when you pull them with your pet (while you being on the other side) the gate will open and will stay opened for the entire fight.
I know it is not some massive exploit, but it may help some soloists who are having trouble handling those adds, or speed up the fight with more people. Enjoy