Grid + Clique
Grid puts your raid in small squares with notable debuffs in the center of their squares and their health is their background color.
Clique allows you to assign spells to your mouse buttons, allowing you to bind say Ctrl-Left Click to Flash of Light, and you can click a raid frame (like the ones in grid) to cast the spell on that target.
Trust me, and I'm sure bodh is going to come to back me up on that. (Well, he is the one touting it usually, so more like I'm backing him up)
I currently use that setup for healing, and it's as simple as clicking squares trying to keep the little bars up and clean. Take a better look at grid, don't be deterred by options. If you take a bit of time to try and understand them, you will be amazed at how flexible it is.
Any time you are looking at trying to mess with addons, you are going to be devoting time to learning and understanding them.
Oh and I believe the problem with healbot (at least for bodh) was that it automatically downranks spells, and while that sounds great, it actually made things worse when he knew that a big hit was coming in and healbot was throwing out a down-ranked spell.