It's not even a matter of survival - obviously I survive quite well, but A) our mistweaver wants to go windwalker, and being that they've been around longer (and their WW gear is almost exactly like mine, thus our damage is comparable) they are to receive the spot. Plus, our healing team is rather top-notch, so unless that person were bad at mechanics (which would mean they wouldn't be in our raid for very long) personal CDs isn't going to be a make-or-break.
The other classes you mention do have a cleave - which in a fight such as Garalon, is hard to give up. I've volunteered to be sat during Garalon thus far simply because of my lack of cleave - it just makes more sense to bring in the extra DK or rogue. I still don't have a kill on that, either (on heroic) - so finding a raid with comparable progression and explaining why I'm 6/16 HM instead of 7/16 like the rest of my guild is a bit hard to explain. Not that I've tried to find a new one, mind you, but not many are particularly looking for Windwalkers (or tanks), and I've not much interest in going mistweaver (I already healed for 6 years, and found that it just isn't my cup of tea)