I agree with you about the visual-layout-makes-programming-easy spiel, but it does seem like there might be a little more to flow-based programming than that. At least a few smart people seem to take it seriously (e.g. on LtU), and dataflow as a computational paradigm has a lot of research behind it and hasn't seen a whole lot of implementation. It's not out of the question that someone could apply it in a new way that would make some classes of application easier to build. I'm open to that and would find it interesting. But after having looked repeatedly for an intelligible technical explanation of FBP, I'm starting to think that the idea is either a trivial repackaging of a well-known model (like Unix pipes, or CSP with directed graphs) or is better shelved with the snake oil. The fact that it's typically accompanied by rather sensational language is not a point in its favour.

Edit: it's too bad that the programming model is getting lumped in here with the visual programming schtick. Those are two different things. (Of course the former would get no PR without the latter.)