I would never deny that Jetbrains ui's are buggy, but a lot of the tools that the IDE provides are slick as heck. I've tried popular editors like textmate and sublime, and Jetbrains' tools' are far better in my opinion. Some of my favorites pieces are it's super fast indexed search, the diff engine for merging conflicts, file history with annotations, and nice version control integration. It makes it very easy to traverse through a large legacy code base.

Some downsides are different command shortcuts across the different products (command+shift+f vs ctrl+shift+f) yes I can configure this, but it would be nice if it was more unified. Also, for Rubymine, I would always go back to the command line for certain things ruby based.