This is my blog post advertising/endorsing this addon I'm using now.   http://www.wowinterface.com/downloads/info11935-EventHorizon.html

Saedo's UI 3.2 So Event Horizon would be the bars I have in the middle of my screen now.   What it does is provides a live moving bar for buffs/debuffs you'd be interested in.

Like right now, the top bar is my SnD, the white line you see going down represents "now" in time.    Visually I have to just watch the bar approach "now" and refresh it before that.

The 4th bar you see is my Rupture, with little white lines representing the tick.    In other words, a visual tick/dot timer.

So what's good about all this is that you can watch events as they happen, instead of staring at numbers.   To better optimize your dps rotations.

It also provides a GCD indicator when you hit your buttons to better not get locked like that.

What I've also added are my trinket buffs, which are the 2nd and 3rd bars.    Along with that, I've set up the Internal CD which is represented by the darkened bars.   That way I can further adjust my attacks if I see ICDs winding down and fire away during procs.

Anyways, the cons of this mod is that it's not very GUI friendly.  All the settings must be written out in the LUA files, and they kinda get overwritten when you update mod via stuff like WoWMatrix.   

But it's pretty easy to set up.    I've adjust mines for colors, 10 sec timelines, and trinkets (not in by default).

Anyways, this ends my speel.   Here's the youtube vid they provided to see it in action: