I think the most important thing to note in order to put this in perspective is as follows:Holy paladins can talent into an additional heal that is like a giant Holy Light. It might take three of these big heals (or two crits) to get a tank from death’s door back to 100% health..
In TBC and WotLK crits generally counted towards overhealing, not effective healing. Crit was focused mainly as a regen stat and not so much an "healing throughput" stat. That is going to make a big switch. It will be interesting to see how the talent tree plays out, but for the last two expacs Crit has favoured HL spam, while Mp5 has been regen stat of choice for FoL spam. That will change pretty dramatically, crit will increase for FoL, still be good for HL. How Spirit will factor in will be interesting as well.
I think the biggest thing is the further homogenization of healers in terms of casting mechanics etc. While I can understand the desire to make sure that all mesh together in a 10 man environment, I will say that I am going to miss TBC raiding where we each performed a very specific function and it was only through team work and playing on individual strengths and weaknesses that we overcame obstacles. Wotlk already has seen the homogenization happen to a degree, having a Holy Paladin and Resto Shaman you can see the small cosmetic differences but how they are effectively the same healer with one leaning to resto druid abilities and one leaning to priest. That is going to continue which is what is I suppose.
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Bode - 100 Holy Paladin - Lightbringer