Its a supplement to Succor, in my opinion.
I get good use out of it by following a Succor with it after a partywide hit. Succor -> Blessing -> let fairy hug people behind the shield. Everyones topped off before the next hit, which is mitigated by the previous Succor and then WD if there is a follow up AoE.

Be nice if it had a lower cooldown, but I don't think its required.
Only way they'd remove the cooldown is to make it cost like 30 FG.

Or maybe im just weird and trust the Fairy to hug the right people. Its worked out for me so far though, lol.