This so much. I hate that this happens because I love Prot so much. I can pull so much stuff and not die, which comes in handy when you don't have Legion Loremaster (I re-joined recently, been trying to get it done but y'all know it's not quick). Basically that's the only reason I keep my guy in Prot. I only go Ret when there is a significantly better tank in the group or in PvP.
Stormheim is the zone you want to start it. For some reason Legion treasures are not worth any experience like they are in WoD...except in Stormheim. I haven't been able to find out any reason for this, and it's possible it may get fixed/nerfed at a later date. But for the time being you REALLY want to jump from treasure to treasure to augment your quest experience.