Thanks for the kind words :). I didn't necessarily mean "useless" in a self-deprecating way. I only meant it in the sense of the linked article called "Write More 'Useless Software'"-- i.e. that it doesn't directly have a production use.
I'm curious what you mean about greasemonkey and noscript. Do you just mean you're astounded that such cool add-ons were made, or something else?