My favorite is when I see a Bard use Requiem on the whirlwinds phase and it never touches either sister the entire duration. The range makes it a smidge obnoxious there, but you'd figure you'd notice the big, purple music note that appears first on your debuff priority missing.
I just use mine on the middle Garuda phases to speed it along. Traditionally I've never seen DPS cause a problem on this fight outside of double melee using the traditional range-favored strategy, though.
Tank, one tank does any work on that fight, the other reads the internet on their iPad! I always get a chuckle when going into a PUG group and OT dibs is called and/or fought over immediately once inside.