After the first 2 bosses most people prefer to skip the optional and move on to the last, but did you know if you have a really good group preferably one that has at least one whom can solo up to Ozumat, the rest of the group can easily use the buff to kill Mindbender Ghur'sha. Me and a friend of mine use this to 3 man Mindbender Ghur'sha, kind of had to just to get my druid gear.
Instructions, clear wing all the way up to Ozumat, have 3 head back to the other wing, have two stay and burn adds, once the waters are nearly cleansed everyone in the instance get's the buff and can pretty much one-3 shot everything in the 3rd wing easily. I'm sure you may be able to find other uses for this, just wanted to share!