I also installed something called Enemy-Grid. I'm not sure how I feel about it yet. It's pretty handy for dot classes, even nice for tank as I have taunt and interrupt bound to left and right mouse button. So just a click on the grid will cast it, without having to switch target. It's bit annoying the way it populates the grid, and how some tall mobs don't appear on the grid if you can't see their nameplates...so not sure if I'll keep it or not. Definitely interesting though.
Still need a bit of tweaking, but I think I have it mostly how I want it.