It was somewhat concerning, especially when you consider that the standard Holy Paladin build spends 4 talent points and a Prime Glyph to support that single spell. So I experimented with a build that eschews the WoG points, and cast Light of Dawn exclusively.
I think it actually worked out better in terms of total healing done, at least for 25-man raids. It was okay in heroics, but I liked WoG a little better there.
- Blessed Life contributed about 10% extra Holy Power (70 points to Holy Shock's 736).
- Word of Glory contributed more (170 points) but it meant that I was mostly using Word of Glory. Light of Dawn's total healing was still higher, even with less Holy Power.
- Tower of Radiance barely contributed any points (11 tonight). Partially that's due to my healing style, but right now it's looking like a terrible waste of talent points.
- I've changed my mind on Haste versus Crit. I forgot that one spell, Holy Radiance, does have a straight HPM benefit from Haste. And Holy Radiance does a ton of healing.
- As well, healing feels "snappier" with a lot of haste. It just seems to play better, even if you are spending mana at a faster rate.
So I'm still thinking about the best Holy playstyle. So far, I much prefer using Light of Dawn as the Holy Power finisher, rather than Word of Glory.
I'm considering trying a build like 31/3/7, and seeing how that works.