I have good memories from an UML design tool that generated Java stub code and kept in sync with code changes. 3D CAD is really great and works well. WYSIWYG

I have good memories from an UML design tool that generated Java stub code and kept in sync with code changes. 3D CAD is really great and works well. WYSIWYG editors often work for 95% of the use cases. For several domain specific niches there are already visual designing tools that work great. Having a text representation in the background is often a plus, so that some edge cases can be solved. But I saw a lot of cumbersome tools too.