I partly disagree with you parawill because i think do not always have to be the one that adapt to the group
Sometime you have to slap some mind put them to work like you do

In EVERY dungeon you can go as 70% dps and 30% heal especially as whm because you got holy as mass control

If dps is low do not stand here to heal for half an hour go dps and make up for the short dps
> Mana will be an issue but tell the tank to wait a bit

If dps is high then that's great less heal and you can full in dps and make it even shorter

... On the cooldown issue yes that's awful because that's what will change you

If the tank is not using cd appropriatly i will fist ask kindly, then less kindly and if stubbornly not helping i will do the same with healing no CD no heal
(It's my way to do it, i do not recommend it of course)
And I follow you if the tank is shitly not using cooldown it reverse to 70% heal 30% dps if not less

But it's also to Us heal... To speak up and voice our disagreement
I won't work more for a lazy player !

...

In my opinion for aoe smashing
Holy should not be blindly spam
But separate by 2 blizzard II
Because it's no use spamming holy on a stunned mob

...

My main advice if healing is :
If a dps take damage give him a regen not cure 2, except if you know that there is unavoidable damage incoming soon
It's pointless to cure a dps when the tank is hit