So this expansion I did something that I haddn't done since Classic, I leveled as holy (and continue to do dailies and such).

I've found that Shockadin is Viable for 5 mans, heroics and dailies if not slow. Why slow? well the burst isnt bad for use but the aoe blows. We have 1 no matter which way you slice it. Light's Hammer or Holy Prism (when cast upon self) The discussion and debate for either are the same in healing as in DPS. You have 2 easy control questions to ask yourself when dpsing.

1) Are the targets in melee with you?

2) do you have GCD's to give up?

If 1) fails, then Light's Hammer is the only choice as Holy Prism wont hit the targets (unless you single target it for a big hit and if its all single target stuff go Execution Sentance)

If 2) is no then Light's Hammer is a no brainer, you drop it once a minute and waste no globals (where as with Holy Prism you cast it every 20 sec)

The Spec and glyphs 

but let me explain the rotation (as is stupidly simple)

Holy Shock (on cooldown our best burst dmg ability)

Word Of Glory (if at 3 Holy Power)

Light's Hammer (on ground below you) or Holy Prism (cast upon yourself as to damage up to 5 targets in melee of you)

Judgement (this should always be behind in priority to Holy Shock, Word Of Glory, or Hammer Of Wrath)

Denounce (use this as your main ability/filler especially when you get the proc from a Holy Shock Thanks to the glyph)

Hammer Of Wrath (obviously only when available and second to Holy Shock except for when withen a 1 hammer kill, and moving onto another target, you should save your shock for the next target)

Sacred Shield should be on yourself at ALL times and you should only use heals when you get Infusion Of Light from Holy Shock for a quick Divine Light if needed.

With partial raid gear (at the time) I could burst up to 50k dps single target, however since I'm fully geared now this number has seen 70-80k depending on other buffs and Heroism use.

As for healing.... my way is a combination of the popular Eternal Flame / Divine Purpose / Illuminated Healing spec and my own combination of 10 man burst healing (for when tanks are being squished) I've found a decent balance in both mass healing for long periods of times and mana regen, But that is only once I reached 10k spirit buffed I could pull it off. (now at 12k buffed)

Also I've been playing with my AOE healing a bit more vis a vis Holy Prism, Holy Radiance, Daybreak, Light Of Dawn (modified with glyph for 10 man) and the benefits outweigh the means (aka mass mana costs). When you use them in proper times (like during Force and Verve in the Imperial Vizier Zor'lok encounter) If you attempt to be an aoe/raid healer all the time you'd better have 20k spirit (not possible yet) or be happy at 0 mana and letting people die. In other words, only spot AOE heal.