Theres a reason everyone stuffs those "other lines" into there.

Its because its proven effective at reducing reaction times.

Typically in a raid, you need to move constantly.

So you have the main tank targetted, and the right mouse held down constantly for ease of strafing.

This way, you press your mouseover, you automatically heal the tank.

When you need to self heal, just press esc and autoheal yourself.

When you need to raid heal, thats the only time when you need the mouse over your raidframes.

With your way, you MUST mouseover tank, yourself, etc to let off a heal, instead of being able to strafe right before and after, saving you time.

Also we all know how crappy the clicking in this game is, sometimes taking 3 or more right click + holds to actually snap the camera and let you strafe.