Telling our users the tools we use doesn't provide any benefit to them. That being said, we are huge fans of ST2, and this seemed like a better alternative to screaming about it from the rooftops :)
Combing over the content on your website, I noticed this as well. I find it to be quite charming and most people won’t read the footer text anyway. I’d say: leave it in.
I design (dead tree) books for a living. In the colophon, I always include information about the typefaces I’ve used (font families for print are usually quite costly — $1-3k — so I mention it to gloat about my purchase as well as wanting to give credit where it’s due), the paper it’s printed on (usually FSC certified), and the eco-inks (if used.) I also mention in which country the book is printed.
I don't mention it’s laid out in InDesign on a Mac and that the copy is styled in InCopy — that’s standard. For programming, there are more options. I use BBEdit and Coda, but I respect your choice and I appreciate you letting us know what you use.
It isn't necessary to the end user, but it is fun to show to designers and developers that we might want to work with.