I took that post to mean that someone (who didn't know shit) had told him not to file if you made less than $5000 from a regular job with taxes withheld and employer matches to SS and Med. Like I said, that would be stupid because if you made less than $5000, you would get back all of your federal withholdings but if you didn't file, you'd get nothing.
It's always better to just file. It either keeps you safe from getting in a hell of a lot of trouble or gets back money... either way, good idea.