I consider UI mockups the perfect usage for visual programming environments. Obviously a visual product compliments a visual development interface. However, it's a very narrow realm compared to the rest of the programming universe.
It's the same as saying that drawing a picture is easier for most people than programming a picture, and it doesn't really have to do with the topic of visual programming, but rather visual design.
It's the same as saying that drawing a picture is easier for most people than programming a picture, and it doesn't really have to do with the topic of visual programming, but rather visual design.