Visual programming is excellent for certain niches, such as audio/video signal processing and the associated automation logic. Examples include Blender's and Maya's compositing nodes systems, virtual modular synthesizers, so-called "open architecture" sound processors, Pure Data, Audiomulch, and many others (including my own Palace Designer for my startup Nitrogen Logic).

When your problem consists mainly of taking some kind of input data, slicing it, processing it, altering it in separate branches, and recombining it, a dataflow-based visual programming system is an incredibly useful tool.