[CodeyWhizzBang]

But isn't the issue that it is people going into computer programming who are struggling with the concept - not just casual users, for whom it really doesn't matter that much if they don't know how to navigate a folder structure.

To extend the plumbing metaphor: it's as if no one on the plumbing course got the concept that taps had to be attached to water pipes and then wondered why they didn't work.