In having to zone out to show someone the way to the raid zone in Wintergrasp, I came across the all to often occurring problem of the portals being broken. This work around requires that you don't already have a warlock inside the keep but you do have a death knight.
If the people that need to get inside will drop raid as well as a death knight from your group, he can duel and use Death Grip to pull the members through the door. While most normal LoS issues can arise (from trying to duel or casting) there are multiple spots on the door from both sides where you can successfully do this.
While it's not a "for everyone" kind of work around, it is convenient for when the situation does arise.
Hopefully this is useful for a few people. Enjoy.