NeedToKnow is a configurable timer bar addon that tracks your buffs, debuffs, cooldowns and DoTs/HoTs in simple bars so you can see all important durations for your rotation in one place.
How to use:
Type /ntk or /needtoknow to open the options, unlock and move the bar groups, then add bars for the spells, auras or cooldowns you want to track and save the profile for your spec.
