Jan 25th 2011 5:31PM I think you're missing a few specific things that Shaman's can do during these bosses.
Slabhide - if you are in a PUG, many people will get hit by lava pools. You will not be able to keep them alive if they stand in bad stuff for more than 4-5 seconds, so throw a rip tide on them and hope they get out.
Ozruk - if your ranged DPS friends are not reflecting DOTs on themselves, you can cleanse Paralyze and prevent them from taking that ~50k arcane damage
High Priestess Azil - you can Wind Shear the Force Grip. This prevents an incredible amount of damage to the tank and makes the fight much easier