I don't use that many, but the ones I do use, I love. I'm on my work computer right now, but I'll try to edit in the actual macro commands later:

* Oath macro (PLD) - One macro which will switch between shield/sword oath depending on what's currently active, and turns on shield oath if neither is up.
* Selene/Eos macros (SCH) - When I summon either pet, these macros change my hotbars to have pet-specific skills into already keybound slots.
* Ifrit/Titan/Garuda macros (SMN) - Similar to the SCH macros, summoning these pets change my hotbars up as well.
* Get to the choppa macro - When I smack the hotkey, it sends a message to the party ("Big hit coming, you know what to do!"), for when party members are eating too many plumes.