Feeling as fulfilled as ever. If you love what you do and find it exhilarating, common-place 'entertainment' is bland in comparison. And productivity's the whole point for a while (I have travel plans / weddings from the middle of the year onwards). There's nothing wrong with focussing on being productive for a while. Think of it like university which may demand 6-12 weeks of intense focus, before periods of completely other activities.