There are several small utilities:
Visio TreeView https://gum.co/wkHG - template for quick drawing the structure of folders and files on the disk.
TreeMap Visio Template https://gum.co/dTHz - similarly VisioTreeView plus TreeMap function - comparative map size of folders and files.
ShapeComparer https://gum.co/EjDU - a stencil with a master shape which is connected between two of shapes and transmits data from one to another.
Connection server https://gumroad.com/l/GSExP - tool for analysis of Visio diagramms. The utility is made as ActiveX dll, containing the class clsConnServ. Dll can be attached to the macro or program.
The most popular so far been VisioTreeView. I hope now TreeMap Visio Template will replace it.
Nice, I've added these to my list of 3rd-party utilities:
http://www.paulherber.co.uk/articles/visio-articles/ (http://www.paulherber.co.uk/articles/visio-articles/)
in the Tools and Utilities section.
Thank you, Paul!