I love Pinterest! It saves me paper, clutter and time. I respect the wishes of those who don't like their work pinned but from my point of view it's a compliment to see my projects pinned by others. I'm not a designer or have any intention of being one.
It's just a great way to note a block, a layout, a tutorial or even just an inspiring color combo that I like and might want to try later. I dislike having tons of bookmarks to wade through when you can just look at a Pinterest board and quickly scan the pictures.