I wanted it because i realized that a project i'm working on has changed a lot over the past several months. would be cool to have a visual history of the evolution. I take manual screenshots but thats too unreliable, and timelapse software is too far on the other end of the spectrum as overkill.

the best kind of data collection is the kind you don't have to think about (and that is only collecting what you want it to...)

I can see it handy when using a Middleman with its live-reloading functionality. Probably just for documentation purposes; or showing off the whole process of development.