Displays various timers for important buffs and their duration such as Heroism/Bloodlust, Divine Protection, Divine Shield, Avenging Wrath, PI and PS from Priests, some trinkets and so on, that are buffed on your character.
Neatly as a symbol and progressing symbols to from left to right and case of multiple buffs on you.
Full List:
Bloodlust/Heroism
Unholy Frenzy
Tricks of the Trade
Innervate
Power Infusion
Pain Suppression
Guardian Spirit
Hand of Sacrifice
Hand of Salvation
Divine Sacrifice
Divine Guardian
Divine Illumination
Aura Mastery
Infusion of Light
Divine Protection
Divine Shield
The Art of War
Blessing of Protection
Coren's Lucky Charm
Gnomeregan Auto-Blocker 600
Lavanthor's Talisman
Healing Trance (the proc from Eye of Gruul and Soul Preserver)
Pendant of the Violet Eye duration and counter
Free Action Potion
Indestructable Potion
I did not include Divine Plea, Beacon of Light and Sacred Shield, since depending on spec, they are 100% active. There are dedicated Weak Auras for those spells.
If you don't like a specific tracker, just delete or disable it.