The mere thought of a Priest complaining about a Paladin's group healing capabilities is to much for me to wrap my brain around!
I can remember a time... back in good old BWL (I was a Mage or Priest back then)... when 40 people struggled together to get the boss down and in the end no one cared about who did more healing as long as every healer kept their designated targets alive. Seems to be gone for good.
To clarify - once and for all: Glyph of Holy Light was terribly OP with it's increased range of 20y. Took me something like the first 2 trashpacks Naxx/Military to notice. Since we european players had the change roughly 24h after the US, my comment in our healer's chatchannel ("Gee - that's way too OP. Bet they'll nerf it right away!") must've coincided more or less with the hotfix to the US-servers when they indeed nerfed it right away.
Now with 8m it at least gives paladins a fighting chance to do fights like the Gatekeeper in Azjol without a shaman in the group and without a sheer massacre to their keyboards. For raids, especially 25s, you still have a very restrictive requirement to your raid positioning if you want to make perfect use of the group heal. It can in no way compete with PoM and even a 6 sec. CD CoH's power - and ANY Priest (even Disc!) who gets outhealed on Loatheb by a Paladin just plain old sucks. Sorry, but that really really sucks!
There is exactly one fight where the Glyph of Holy Light still absolutely dominates (and there it did even with 5y range): Razuvious - melee splash-heal. This is just because first the Paladin of course spams Holy Light to keep the disciple up and second Razuvious' hitbox is so ridiculously small that all melees are almost constantly within 5y (or 8y now) of the disciple. On that fight I get an easy 40% of my total heal from the glyph (of which again easily 60-70% are just overheal) and 10k HPS are quite normal. If you have 2 Paladins on the disciples they can keep the melees up single-handedly. Oh my got - they should definitely nerf that! /irony off.