I, personally, feel that feeding the birds has become a big business and it's not always good for the birds. It really is for us humans to enjoy, and I'm not sure it's good for the birds. I only feed them in horrible conditions, when there are sub-zero temps and everything might be covered with snow. And it's only for a short time. Instead, I've grown bushes and flowers that make food for birds, and we also have tons of weeds that give seeds. Weeds have a function, and not just there to irritate us!
Yes, I love bringing them close so I can see them, but it's like Bae mentioned.......it's not really "natural" and may lead to problems for the birds.