I love Haxe so much. I have been using it as a blazing-fast replacement for Gulp. I have < 10ms build times for large js libraries, where Gulp would take a second or 2. I like to do alt-tab F5 really fast after I save and thanks to Haxe I don't have to wait a second :).

I wrote a lot of features that I used to need in gulp (+ plugins) in Haxe, which is a great way of learning to use it, and a great way to find out how nice it is to have type safety.

Also, the language allows a simple JS / AS dev like me to build multithreaded apps that carry extremly heavy weights.