I'm not going to sugar-coat it: Holy paladins saw a massive stealth nerf delivered recently. Tower of Radiance, once the pinnacle of a holy paladin's healing strategy, was reduced to rubble. ToR previously granted us an extra holy power point any time we used a core heal on our Beaconed target. The new version only works with Divine Light and Flash of Light, our two most expensive heals. Our holy power generation mechanics basically limit us to one holy power point every 6 seconds. Daybreak can help by letting us snag extra Holy Shocks, but not in a predictable manner. Tower of Radiance allowed us to control our holy power generation by using Holy Light to pick up a few extra points whenever we wanted.
The key to Tower of Radiance's potency was the cheap price of Holy Light. If we needed extra AoE healing, we could generate holy power points and then spend them on Light of Dawn. When low on mana, we could use our cheap Holy Lights to build points towards a zero-mana Word of Glory. ToR gave us the flexibility to do something productive with our Holy Lights during downtime and allowed us to exploit our free holy power-based heals. To make matters worse, the developers nerfed us from the other direction, by lowering Light of Dawn's potency by 40%.