Why should I use structured programming all of a sudden? I've been doing just fine with goto :)

Your response encapsulates most people's view of traits. Though they're very easy to use and do a great job of managing complexity, there really needs to be a 'traits paper' written for Perl before the Perl community really groks them. There's a fantastic one showing how well traits performed in refactoring the Smalltalk base classes, but since most don't know Smalltalk, they don't pay attention to the paper.