As someone who still occasionally has to write Perl 5 for a living, Perl 6 really is a new language. And because Perl 6 isn't as mainstream as Ruby or Python, there is a bigger culture shock when trying to find resources or figure out the "right way" to do things (I know, I know, There Is More Than One Day To Do It). There are big changes to the syntax too that make it feel like less of a successor and more of a new language inspired by an old one.