There are many, mostly in graphical design.
Blender has Shader Nodes and Geometry Nodes to program shaders and parametric geometry respectively.
Unreal Engine has Blueprints to program animations, AI, etc…
The main reason is that graph programming is slower to program with, we are much faster at typing on a keyboard than moving a mouse around. And most graph languages are more limited in abstractions. They tend to deal with really simple types.
But I think we could have a graph language fully featured, it’s just that it takes a lot of effort to develop and people will switch to text most of the time.
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