According to this guide, the only thing you can offer to your raid as an enhance shaman is one debuff from one particular axe, which is not all that strong or interesting. Most probably people will not like stormstrike debuff on a boss. It looks like at 60's you have much more use out of enhance spec on BG's than in raids. Pve equipment, if i remember correctly, is dedicated for caster specs. Pvp rewards, in the other hand, are pretty strong for a typical windfuhrer.