I do have a publication in VL'96, which is for visual languages. It's about a new method for teaching binary search tree algorithms using visual programming.

My publications tended to be rather unusual approaches to problems, rather than refinements of existing approaches. They were well suited to software engineering conferences.

Not sure how suitable they would have been for graphics/visualization conferences...

I should also add that it's not clear how much of my work can be categorized as "visualization". It depends on what you mean by that. But there are several papers that will help you understand code, even if you might not consider them as visualization papers.