For healing I use a single click bar, with 3 buttons, top, middle and bottom, which are the full width of my party frames, exactly like in that thread. It works really well for situations where you have a single healer, and possibly an occasional off healer.

For teams where everyone is a healer, e.g. 5 paladins or 5 hunters with mend pet and exhilaration, it would probably work better with a single click bar with 15 buttons, 3 per unit/character. For single healer situations it would just duplicate existing functionality 5 times. For multi-healer situations it would allow more fine control at the cost of more key/button combinations being used and needing to be remembered. It is something I have been meaning to set up and test, but I just haven't got around to it yet.