I don't use it while raiding, unless I forget to take it off in a nightfall.
Normally vs atheon while everyone is in the portal I will use the ability cooldown to have me and one other jsut spamming grenades at atheon.
We have killed him sooo many times while people were still in the portal.
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We once killed Atheon by Self-Resing He had a silver of health left, you couldn't even tell if he was dead or just lagging alive :P And everyone died (succumb to oracles) and SOMEHOW one Warlock still had super and it wasn't drained when the Oracles stayed alive too long, so he self-resed and shot Atheon just once with Icebreaker and we got the rewards, that keep in mind that at the time, Crota wasn't out, and we were level 29-30s doing Vault on Hard for the 2nd time or something, so we had spent an hour on that sh*t but this guy just saved us who knows how many hours or even a give-up.
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I killed crota the second the oversoul exploded, it killed us all and our screens went black:P we got rewards but was super awesome haha. I haven't had any close calls like that on atheon. we have done it with 3 people because our 4th died. We just had a warlock dieing before teleport and self rezzing.