Interesting thoughts, thanks! I have gone over there to browse but it seems hard to navigate. There doesn't seem like there's any rhyme or reason to anything and it's all just a big jumble of different people's stuff that I have no interest in. Maybe it looks different if you have an actual account?
I do like the organizing idea (and I'm a visual person too) but a few people I know who 'pin' do so with the smugness of one trying to make a point. Like, "look how uber-crunchy-organic I am and all of the raw milk recipes I have pinned, I'm so much healthier than thou". And they have their pins connected to facebook so every time they pin I see it in my FB newsfeed. Drives me nuts.