I two heal Normal Garalon with a Resto Druid. Of every attempt I've ever had, I don't think I've ever used CH or HR on this fight (I heal tanks and kiters, though). Technically using HR would be optimal due to the sheer HPM of the ability, but it does assume your raid will take advantage of it. I endure pretty easily without using HR and ultimately just feel it would complicate things for our raid if I asked them to be mindful of it. I also don't use RT glyph.
Without CH or HR you're pretty much left with just RT, GHW, and HW. The rest, like HST, are pretty standard. It's slightly less mana efficient, but I don't go OOM and our DPS kind of squeezes past the enrage timers so I typically last all fight unless horrible mistakes occur, but even then I usually manage to the end with only little struggle. If this hasn't already been put in perspective by now, my raid group is kind of average, so we only witness these fights way beyond gear levels that others probably have first done it in, but I love my mana efficiency. =)
Anyways, cooldowns are a huge thing both raidwide and personal. I've really emphasized intelligently using defensives for abilities like Crush, particularly when a raidwide cooldown is unavailable, and I think that really wins it for us, otherwise we might have mana issues.
There are definitely times to use HR or CH, but not very often in 10 man IMO. I usually just use my HST, Riptide people, and HW if appropriate. I'm an old-fashioned kind of healer, I guess.