I used vim daily for 15 years and I recently switched over to Atom. The reason was that I felt like I was handcuffed to my custom vim configuration. My ability to write code quickly was coupled to my editor configuration. Even vim bindings weren't enough in other editors due to the muscle memory of the custom bindings I'd built up over the years. Within a couple of weeks I was comfortable in Atom. I still miss some of the conveniences, but ultimately I like being able to pick up and start developing anywhere - without pulling in my dotfiles first.