Okay so I just made it to endgame. I'm a BLM and my rotation is

Thunder 3> Fire 3> Fire until 300-700 MP. > Blizzard 3> repeat.

In situations where I have less than enough for Blizzard 3 I keep transpose handy but I'd rather try to use Blizzard 3 if My MP is around the threshold.

In case of Thundercloud I'll use Thunder 3 asap. Firestarter use depends on how much MP I have left meaning that if I'm at or below the threshold I'll save it for after Thunder 3.

As for Raging Strikes. Well I don't really use that because if I need that skill (which has a cooldown thrice that of the effect's duration) to bring it up to par, then my DPS already sucks and would continue to suck after the buff wears off. So I try not to use it at this point (may reconsider if endgame content has needs that exceed normal DPS limits).

AoE skills I don't know how to work out for dungeons because of that enmity thing (and I'm going for Paladin next instead of Bard so Quelling Strikes would be a while)