As Healing Touch and Tranquility are not used very much at higher levels, this talent is not very popular among high level Restoration druids. The reduced mana cost for Nourish can however be put to good use with certain builds.
Healing Touch will be one of your most effective healing spells at lower levels, which makes this talent useful. Reducing the mana cost of Tranquility can also be useful for dealing with area of effect damage before Wild Growth becomes available, although the long cooldown of the spell limits the value of this talent.