For me, when it comes to the Valley, it's the farm. The dang farm. Not because of the game play, but because of the piece and quiet it offered. To these people you're nothing more than a stranger, even if you're playing a Pandaren, who comes from a different subset of the culture anyway. You can just settle down peacefully on a farm with your pal who you bought the farm from, and instead of grinding rep, you have friendship meters with the local NPCs and... gosh, the Valley is so good.
Shame what the farm was a precursor to...