The UI can always be updated, being proficient in something no matter how it looks will take you farther than hoping on or abandoning tools based on their appearance.

Who said anything about looks? I'm talking about how it feels. Very important distinction, and not something that seems fixable for a cross platform app. I'd been using TextMate since 2006, and I was extremely proficient with it. I only gave it up because it was so outdated (main thread find-in-files, e.g.).