No. That's "just" a very nice bonus. The main selling point of Cultivation is that it adds up to a very large amount of healing done on progression fights, and it's concentrated on people who actually need it. Looking at last week's Xavius kill, Cultivation did just over 10% of my total healing. All of it essentially smart.
Cenarion Ward heals for a ridiculous amount. That alone is reason enough to take it. It's useful both for stabilizing tanks and for keeping DPS alive, especially if there's a DoT on them. The spell is clumsy and awkward and there's really no point when you can actually make use of its unique mechanics, but it heals for so much that it doesn't matter.