Ronin

this addon is tailored to palladins but works well with any healer. you can set it to how you like to/ need to heal.

i highly recomend everyone who heals to at least check it out. i swear by it.

PANZA

for pallies, it gives you 1 button to bless the whole party with whatever blessing they like.

for all healers, 1 button to choose who needs the healing the most (according to your settings and biases) and then choses the appropriate rank and appropriate spell to heal just the right amount of HP so as not to over heal and waste precious mana.

for priests, instead of blessing, includes 1 button to buff the entire party etc...

please check it out.

Edit:
this is a bit of what the site describes Panza as:

"Panza helps Healers, and Buffers with buffs, healing, and cure duties. Panza supports all healing classes, and the Mage class. Both Alliance and Horde. Panza is completly event driven, and will let you know who missed what and when (using the included Titan Plugin).

The buffing code will select the correct rank of spell based on the targets level. It will also cast specific buffs based on class and if the target is Solo, part of your Party, in your Raid, or on the Battleground.

Save specific buffs for any friendly player and use that setting instead of the default when auto/cycle blessing.

Cycle through party or raid groups, and autobuff everyone without switching targets. This also applies to Healing, Curing, Panic, and Free (Paladin Only) functions.

Cycle through nearby players and autobuff everyone in range. (Automatically switches targets)."
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Does this tabard make my ass look fat?