Healers and GCD Clippling and Weaving Question

[Satarn]

Also, I was thinking of going with WHM next which I know next to nothing about optimization. Looking at the skill list, it looks like you may in fact be required to clip your GCD on WHM since you have few instant cast spells unless I'm missing something obvious.

On WHM you use your afflatus spells for weaving and movement when you can't just refresh the dot - while they don't do damage themselves, they charge up your Blood Lily, so eventually you can use Afflatus Misery to get back some of the lost potency from not casting Glares.