I'm using Pitbull for my Unit Frames.
I find it to be very easy to customize.
It took a bit to learn, and I asked a few questions here, with good responses.

I also use Grid and GridCustomLayouts.
You can configure it to appear the same on each screen.
You can configure it to show one layout in parties and another in raids if you want.

I would think you'd get the most benefit from having Grid displayed exactly the same on the master and healer toons.
You'd then set up your mouse repeating region(s).
Click the desired box on the main, and have it repeat in the same spot on the healer.
Have Clique enabled on the healer, so a click actually does something other then just target the toon.