I think it really depends on the kind of problems you are trying to solve: expressing programs visually is very common in signal processing (see for instance GN

I think it really depends on the kind of problems you are trying to solve: expressing programs visually is very common in signal processing (see for instance GNU Radio and Pure Data) because the flow of the signal through different components is one of your main concerns. Also having easy to tweak parameters in the form of knobs and sliders widgets, or adding for instance an oscilloscope node anywhere anytime, aids your development workflow a lot.