Here is a data point that may be of interest: On YouTube, since links are filtered from comments, many users link to other videos by posting the "tails" of URLs - some with "watch?v=xxxxxxxx", some "?v=xxxxxxxx", and some just post the random-looking video ID part with nothing other than "see video xxxxxxxx". In other words, there's evidence to suggest that a reasonably large portion of the otherwise "computer-illiterate" have at least a basic understanding of how URLs work and will edit them manually to get what they want.

Edit: or to put it another way, there are people who, upon having made extensive use of YouTube (or possibly other sites), have been able to notice the patterns in all of its URLs, and use that knowledge to succinctly name a video, without explicitly giving the entire link. They are also implicitly teaching others about this knowledge in the process. This is a perfect example of the kind of learning experience that would be deprived from those whose browser hid the path in URLs.