I've been the sole Eclipse developer in a number of places where everyone used IntelliJ. At least a couple of the places had switched from Eclipse after having been worn down by that one incessant IntelliJ guy. A few developers discreetly confided that they would rather have stayed on Eclipse, and some new people followed my lead. None of the places were 'IntelliJ shops' though, any more than I know of any 'Eclipse shops'. It would be rather poor form to hard tie your projects to an IDE, so it was always fairly doable to run with your IDE of choice.