The changes to WHM remind me a lot of Holy Priest in WoW. I'd like to see some of the differences in Holy Priest be applied, actually.

For example... Holy Priests have Holy Words. These are long cooldown abilities of 3 types: damage, single target heals and aoe heals.

They then have serendipity (similar to Lily's kind of). A passive that reduces the cooldown on your holyword spells by 6 seconds whenever you use the regular GCD's corresponding ability. That is your single target GCD will reduce the holy word single target heal, your damage gcd's will reduce the holy word damage gcd and the same for aoe heals.

This is predictable, and rewards using your abilities with more MP free/powerful cooldowns.
There is then a 3 min cooldown ability (granted, it's a talent there) that increases the effect of serendipity by 100%.

I like this more, because it's less RNG based and more predictable in use, and works for AoE heals, DPS and single target heals