Visual languages like LabView were a big deal in experimental physics when I was a grad student in the 1990s. Many data analysts do work with tools like KNIME and Alteryx and from time to time they've handed a model off to me which I would package up so it could be built into a client or server application.
Way back in the day I worked for a web development shop that had a language called Tango that would let you define the logic of a web application by snapping blocks together, and then you edit web termplates in a side window.
Tango may have compared favorably with ColdFusion, plain PHP and other tools from its time but it lacked the model-view-controller, model based kind of thinking that came in with Ruby on Rails...
LabView is nice. Yahoo pipes was pretty cool.
Neither is a general purpose programming language.
The Russian space agency had a visual programming language called Drakon -- obviously I never used it. Looks interesting.
I've been tinkering on my own for a while. It will also be unsuccessful more than likely (but I don't care -- still interesting).