From what I've seen perl6 makes some operations more convenient. Cool, I guess, but not a great reason to reach for perl6.
Grammars are really cool, and one reason I might reach for perl6, but you also have really great special-purpose tools like Antlr. I suppose I don't feel the need grammars that often to need them reified in my language of choice, but next time I need to do some parsing, however, I will probably play around with perl6.