While I don't main raid as Ret, I still set up an Inquisition weakaura for LFR. It's just an icon that's to the right of my character that has a timer on it, which stacks on top of other buff timers when they come and go (Avenging Wrath, Heroism, etc). I don't have too much of a problem tracking it where it is, since it's so close to my toon that I can keep an eye on my environment while I watch it, and I also watch other buffs in the same spot with my other toons.