PoM does not increase Spell Speed anymore since launch of HW...its a flat increase to Attack Speed (in this case its reducing cast time by 20%), thus it has no effect on DoTs or HoTs.

I'm not denying WHM heal the best, I'm just saying although WHM is best in healing, AST is just 10% behind WHM in AoE healing, and 3% behind in tank healing, and if you think that's strong enough, then there's honestly no argument between us anymore, since we compare things differently.

DS is indeed the most powerful tool a WHM have in its arsenal, I will not deny that. I miss this god damn skill so much when i played as an AST.

I can write an entire post regarding the newbie trap skill Cure III, but here's the gist of it:
1) Medica II heals for more and at lesser MP cost.
2) Cure III MP cost is way overtuned
3) In situations where people must be topped ASAP and cannot wait for Medica II ticks, a Cure III + your co healer's heal usually results in overhealing.
3a) Well that's good right?! Means my co healer can save a GCD, he can go dps or something.
3b) But out of 3 healers, WHM has the WORST MP recovery, unless you are speed killing where every GCD counts, it is always better to use Medica II +co healer's AoE heal.

Don't get me wrong, I love Cure III, it had helped me prolong a progression fight a minute or two for us to see/practice the next set of mechanics, and that's my personal opinion of what a WHM's identity is:
The healer that can drag your carcass along for a minute or two in a fight (and I love it).