Essentially this. Anything that an Enhancement shaman could bring to raid, the consensus is that an Elemental Shaman would be a superior option.
As far as melee goes, the Shaman does not have the same raid utility as say a rogue (smoke bombs/sheer dps) or a warrior (banners/cries).
It doesn't seem as if any of the top guilds raid an enhancement shaman so that begs the question from me, "In it's current state in top end progression why would you bring an enhancement shaman?"
I personally prefer the playstyle over many other melee DPS.