Assuming I'm going to be playing through 2.4, 2.5, 2.55, HW, StB, and ShB in short order, should I save my Poetics or just burn them on the iLvl 120 Ironforge gear?
You might need to do as there is ilevel requirements for some of the 2.4, 2.5, 2.55 instanced content. I wouldn't spend them though until you reach one of those points just to extra sure.