Take a look at these combat logs. - he's 8/8 gold, four of them best EU. The log is for 6 runs. Here's the healing distribution:
Code:
Regrowth 23.17%
Rejuvenation 14.96%
Lifebloom 11.06%
Living Seed 10.11%
Germination 9.57%
Wild Growth 9.35%
Cenarion Ward 6.13%
Swiftmend 5.38%
Nature's Vigil 4.25%
Wild Mushroom 4.23%
Tranquility 1.14%
Lifebloom 0.34%
Healing Touch 0.04%
Apparently glyphed Regrowth and its living seed has tremendous potential. Cenarion Ward heals for a larger amount than Ysera's gift in my logs, and you get a targeted potentially life-saving heal. Tranquility is barely used, and even more suprisingly, Wild Mushroom, which is my bread and butter, is unimportant with the playstyle above. That might be due to tempo requirements.
And: In the above log all the healing over time spells have significantly more overhealing than the static heals. Living Seed has 4.12% overheal, Wild Growth 32% overheal, Rejuvenation 17.3% overheal.
/Discuss.