I've been using PW:S glyph for a while now.
I dig the 3-4k (Depending on buffs) insta crit when casting bubble on someone...which then procs divine aegis.
I know aegis from such a small heal isn't much, but hey its something.
Recently I've been considering switching out flash heal for holy nova. I find myself enjoying holy nova in ICC10 a lot...
And almost any 5man heroic can be healed completely by nova
Haven't felt the need for PoH in any of ICC that i've seen so far. On the good Professor, I cast PoH maybe twice or whenever inner focus is up. I macro that to PoH.
We have a good holy priest that handles aoe well. I mostly bubble and keep PoM bouncing around for that fight. Again I find Holy Nova to be fun and somewhat useful there.
When running from orange to green, its just fun to pop a few off.
On Festergut if I'm stacked with the melee group, Nova can be groovy too as a quick top off.