I moved from NYC to DC and regretted it for the entire period (5+ years) that I stayed in DC. It's so dull by comparison. Even in the dead center it feels like a suburb. Worse, people come and go constantly so it's very difficult to build a stable solid social life. Every time I started really vibing with new friends, their job would disappear or send them to Kansas or Kabul or something, and I'd have to start over again.

Only positive thing I can say is that it's way better for cycling than NYC. Good infrastructure in the city, and fantastic paved trails throughout the surrounding areas. When my friends would move away at least I could spent the weekends exploring on two wheels.