If youre very geared this may not be very useful but on the heroic/normal gunship fight adds spawn on your ship through a portal. If you use a dk ability gorfeind grasp the very second they pop out of the portal on an add thats standing on the portal it will grip all adds to it and bug them, taking them completely out of the fight.
I'd assume you have to time it perfect to work but I was able to do it with little effort multiple times in the last couple of weeks times.
I would also assume that it is possible to do the same for any raid/instance adds that spawn through a portal on any fight but this has only been tested in icc.