At 45, you get sacred soil, which can also help reduce aoe damage for a short time.
At 50, you get lustrate, which will give you far better burst healing capabilities, or the ability to heal 3 different people with one global cooldown. (adlo on one, fairy on another, and lustrate off gcd to a third).

Sch have many abilities to juggle, learning how and when to use them all effectively is key to being overpowered.

When you need to squeeze as much aoe healing as possible out of your fairy (eos), use fey illumination first, but make sure everyone is in range to receive the buff, which will increase all healing received for 20s. During this time, use adlo/succor/etc. as normal, but with a 20% boost to the amount healed. Before it wears off, hit rouse followed by whispering dawn, for maximum aoe regen. Timed right, this will provide extra healing for almost 40 seconds.

Also, most of the time (90%?) single target healing is more than sufficient, especially in 4man groups.