I can't say I find macros like this useful at all. Mouse over healing (at least for me) is highly inefficient and depends on people's movement. I can just click the name in the party list or press the corresponding F key and immediately I have whatever person I want to target without fumbling to mouse over them. Also, I focus target the boss at the beginning of combat.
But just because this works for me does not mean it works for everyone, but given the amount of ways to target people, I don't think there's really a need for all of the macros. At least for healing.