I recently leveled my goblin shaman and experienced far better XP/hour as enhancement than elemental. With most quest mobs I didn't bother with totems (why waste a GCD?) and still cleaved through the content. And when you get Maelstrom Weapon you just tear up quests with zero downtime. The trick with enhancement is that you don't stop moving really. Earth Shock on the run up to a mob, Stormstrike/Lava Lash, loot and start running again. Whereas elemental required stopping and watching cast times in more of a caster-nuke style.
Of course, the nature of quests has changed so that there are far fewer multi-mob pulls where I could certainly see elemental being more efficient for killing off groups.
Both are interesting and can be fun. But the speed at which enhancement levels now is shockingly fast. Quite possibly the fastest spec of any toon I've ever leveled with.
[h5]"I'm gonna need to see more math I don't understand to believe all this"
"I'm not directly saying that you're this type of person, but I am implying it." -- Pigtails of DOOM!
Therion the Light of Dawn - Phezz the Insane - Snaffu @ Proudmoore US[/h5]