Yeah, I'm currently at 67 on my shammy team as well. I rolled a Druid on the same server and gifted it to 60 and I'm now leveling herbing on it just for a change of scene

Basically you want a change of scene, if you really want to push to get your shammys to 70 then maybe go 'outside' and do some questing or something or maybe queue for some BG and PvP for a night, you will find you learn a lot quite quickly in PvP BG's, at least I did.