Here is some ancient history on how I got hooked on Visio and started this company. These are a series of articles I wrote in 1998 for an online magazine called Design-Drawing. Design-Drawing went down sometime in 2000 or so but these articles live on.
The first one was called Colored Dots and Sleepless Nights. I am sure a lot of integrators can empathize with the central theme.
http://www.design-drawing.com/visio/digitoola.htm
Here is something on how to draw smart rack shapes by the numbers.
http://www.design-drawing.com/visio/DrawNo.htm
Here is something about how to create Auto scale fonts.
http://www.design-drawing.com/visio/autoscale.htm
This information is kind of dated but it clearly illustrates the initial ideas that still resonate through the company today.
Adam