The reasoning for this is pretty simple: the majority of my full-time job is spent working with WordPress. I love the WP-ecosystem, and would really like to contribute my own plugins / themes etc, but find that hard to do when I’m only 9-5ing it.
I still use Python and Django in my spare time a lot – I plan to write up a bit more about my Google App Engine Project pretty soon, and am actively porting another from GAE back to Django (the new pricing model has scared me shitless, I expect it’ll be more of a prototyping platform from here on in). So no need to fret there. Not that you were fretting. Obviously.