There have been some general purpose visual programming environments which have had some degree of uptake. Prograph is one (http://www.andescotia.com/products/m

There have been some general purpose visual programming environments which have had some degree of uptake. Prograph is one (http://www.andescotia.com/products/marten/ http://www.andescotia.com/products/marten/) - it is certainly niche but apparently there are users.