I wanted to know if you use any mods to help in seeing who needs to be healed and who needs buffs. I don't plan to heal much just in those cases when my guild do old world runs for fun and I'm the only healer class available. well I take that back I might dual spec healing once it comes out :)
I use the mod Grid to see the healthbars of everyone in the raid. Grid can also be configured to show when a specific buff or debuff is on a character, and I have mine set to show Beacon of Light and Sacred Shield.
For paladin Blessings, I use PallyPower.
Those are pretty much the only mods I use. I do have all my heals use a macro so they cast on mouseover.
/cast [target=mouseover, help] Holy Light
This allows me to just hover my mouse cursor over the person's healthbar on Grid and cast the heal, rather than explicitly switching targets.
That's about it for mods and macros that I use for healing. It's pretty much just Grid + mouseover macros.