Mine is:

/castsequence [@<charactername>] reset=5 regrowth, rejuvenation, lifebloom, lifebloom, lifebloom

That keeps your most efficient/glyphable heals up front so you only get into the heavy healing if you keep pressing it.

If you're doing PVP or heavy movement fights, you might want to put regrowth on another button so you can spam hots while moving.

There are only two AoE heals for druids: Wild Growth and Tranquility.