IMHO, all AoE heals goes to a key press. It's not targeted on a specific character so there's no need for mouseover. I currently have it on F10.
For mouse over single-target heals I still use keys. I mouse over a raid frame and hit one of my "raid heal" keys (happens to be shift-1 through shift-5 in my case) and it will cast the corresponding heal spell on that character, no matter which character I happen to have as main at the moment.
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