I don't think that's why most people don't say 'Anyone can use my stuff wherever.' Take me for example, I don't simply say 'Take what you want, whatever.' but if someone where to ask, I would let them use damn near anything I make. Assuming they are doing their own thing with it, and I get some simple credit for what they use. I think that says a lot in itself, because I'm here for a job, yet I don't meticulously safeguard my work. I simply want to know where it's being used, and why. And I have a right to. I pour hundreds of hours into my works, so if someone 'stole' one of them, that would just svck.
I understand what you'd like to achieve. If, for example, you licensed your work under Creative Commons, authors of derivative works would be obliged to give credit. You're also entitled to ask for notification of use (which is best practice, anyway).
Licensing relieves both parties of the work involved in negotiating permission. It aims to remove a psychological barrier to creativity, while being fair to everyone.
