in reply to
Python and Bash more useful than Perl?
People really use useful and fashionable interchangeably
Just like how vim has suddenly become the most productive editor ever(Even around 2-3 years back there were no talks of it, now every two days vim stories are trending on reddit/HN/slashdot). Suddenly people have discovered Test driven development(The shocking thing is some believe Ruby community *invented* it through rails)...
Fashion changes! So don't be shocked if the same people find something else that is famous useful just 2 years from now. Mean while, the guys who are actually good at doing things use what is most appropriate for doing a task and finish it.