I don't know if those are your videos, but could you perhaps load up ones that actually show healing numbers for Holy Radiance? as well as a better view of Light of Dawn?

Proper positioning takes time and is often also dependent on your group. There is no time to waste when the group needs aoe heals and it is often a waste of time to run to the position to make best use of Light of Dawn, only to have your group members then move to a different position.

In raids, it might be different if we can hit more targets with Light of Dawn, but for most 5 mans I've found it much better to simply rely on single target heals and pray for Daybreak or Eternal Glory to proc to heal the group. Especially because even if Light of Dawn does hit, it really doesn't do that much healing anyway.

Hey Toy, have you played other healing classes, such as a priest or a resto druid?

The heal relatively is on par with Circle of Healing and Wild Growth. The only differences is that Light of Dawn doesn't have a cap, and the other two spells are smart heals.

As for proper positioning, Blizzard is making it somewhat mandatory for all healers, due to the new GAoE (Ground) heals like Power Word: Barrier and Healing Rain. Much like we have to relearn how to use multiple spells again and triage; we will have to learn the proper positioning for our spells and use them accordingly with our group.

As for five mans, I've been watching the heroic versions of the new instances, and I have to say that ignoring an instant cast AoE heal in favor of procs may not be the best option. Especially now that it's not dependent on Holy Power anymore.

Light of Dawn doesn't heal for a lot- but it's an instant cast, frontal-cone AOE heal. It's something that you can hit the button and it happens. It requires skill similar to the use of Shockwave, the warrior tank frontal-cone-AOE stun. You never will get a perfect use of it- but the question is, can you get it so that it's better than what else you can use? In a 5 man, for instance, you don't need to hit all 4 other people with it- if you can get the tank and maybe one of the DPS in the hit box, if there's AOE going out, that should be enough to keep them alive- all you've committed to it is a GCD.

It can also be used while moving- moving to a place where you can hit them with another one later- or moving out of a fire, or moving to avoid lasers.

Theoretically, if you have AOE damage going out, let's say you need to heal all 5 group members, you need to move, and can only reach 2 people with Light of Dawn- I think it'd be worth it to use it anyway; you heal 2 people plus yourself, three in all, then holy shock-word of glory to keep them from dying...

And while doing this, you can have moved across the room, and still have kept people from dying. Admittedly it wouldn't be optimal, but it's more mobility than paladins have had before... and I think that's the big niche that Light of Dawn helps fill- mobility and mobility AOE healing.