I once had the pleasure of following Damian's presentation techniques course. A really good course that i can recommend to every programmer and engineer. Perl and me however do not get along. Yet still looking forward to see where perl 6 will go.
As someone who's been distantly following Perl6 from its inception, the new RE grammars are the most exciting thing to me. It's the one time I've seen a YACC type thing and thought, "ah, this is how it should be."
I predict that if Perl6 ever becomes somewhat released/stable/fast we'll start seeing a bunch of compilers/transpilers written in it.
> You have to give them a way of focusing on one level of abstraction at a time.
Very true. Though having levels of syntax can actually help with this, such as python's indentation. The boilerplate of if and for helps beginners to recognize it.
In contrast, I've seen Group Theory notation with juxtiposition for both function application and composition, distinguishing functions and variables by alphabet and inference. It's very compact and elegant, but hard to read at first.