My eyes puked from the motion sickness of not-knowing-where-to-look-oh-my-god-everything-is-everywhere-ness of the page. It’s a typical case of ‘designed for developers, by developers’, and I’m sure most regular Stack Overflow users have got used to it and don’t mind. Perhaps they even like it. But a little bit of care over the design could make a huge impact on usability for newcomers, and regular users too.