Here's a post with my script in it >clicky<

It's straight mouseover healing, no clicking, no mods outside of Pitbull to arrange the party frames {include self in party, list alphabetically}. Because of how it works, it's very modular. In fights where my tank takes a lot of damage and there's not a ton of AOE, I just swap my macros around. Or I can drop in LHW instead of Chain heal. I don't have to make any changes at all when I go from group to raid...my raid frames all sit in the designated area. And because it doesn't require me to click, it's fast. I just wave my little magic mouse over the frame and poof, all better.