Are you really comparing a class that can heal itself to a class that can't? :P
The fact that we're allowed to heal in ANY spec means our need for ridiculous CD's like mages get is lessened greatly.
In addition, I'm pretty sure PvP will be getting some pretty heavy revamps going into MoP because.. it's kind of a selling point for the expansion.
Guess what: your :P don't cut it for me. Mages will be able to heal themselves for 20% of their total health instantly w/ Cold Snap. And undo 100% of damage they suffer for a full 8 sec if they have the talent in addition to their lvl 90 ability. And stagger 2 silences for unbelievable coverage, not to mention spamming Polys and having escapes like Ice Block, Blink, Invisibility (or Greater Invisibility). And get massive dps boosts from their lvl 90 talents.
And our healing. Yep, I know you go full Resto for both your specs, so maybe you don't understand how Healing Surge just doesn't cut it. Sure, there's Healing Tide Totem, which can be 1-shot and ticks 5 times during its duration for 15K or so healing if it isn't one-shot. (perhaps, what, 20K at max level?). And there's Ancestral Guidance that will heal you nearest ally—but no word yet on whether you, the Sham, will ever get any healing from it. And then there's Healing Surge.
But Ele has lost Elemental Warding (12% reduction in incoming magic damage) and Spark of Life for healing boosts. And, again, look at the silence coverage a mage will have: Fun trying to work in damage, let alone self-heals with the almighty Healing Surge.
Ele has suffered greatly from poor defensive abilities and damage mitigation, and nothing in the current tree makes up for it. Those defensive abilities may seem to be adequate when viewed through a Cata lens, but we are talking MoP and a slew of added stuns, CCs, a silence, and many self-healing abilities for other DPS classes.