That's a lot of snark for someone making such a broad generalization. Look at a program called Houdini and it's shading language. It is domain specific but includes branching and loops. The interface uses openGL and is extremely fluid. If that wasn't enough, it is live, so while you are working you can see your results in real time. You can use it to manipulate geometry, images, sound / animation, as well as the original purpose of writing shaders. That visual programming IDE has been enormously successful.