I was aware of this fight, but the way you said it, you made it sound like something that happens a lot more often than it does on Naj'entus.  And, yes, CoH is very good for that fight if used properly.

Even for that fight, it's not about topping people off, it's about getting people above a minimum threshold.  For a fight like that, when learning it, many guilds will heavily favor Resto Shammies and CoH Priests over Paladins and Druids.