During all that time I've thought of IntelliJ IDEA as a sort of edge product, one of those things that a few borderline nut cases like, while everyone else uses the perfectly good (and free!) Eclipse. I had no idea that IntelliJ IDEA, along with Jetbrains other products, have been gobbling the IDE space up. I'm very glad to hear it, though – their products are first rate, the community is great, and they just keep making it better all the time (as the linked article points out).
I had the chance to meet some of the Jetbrains folks a few years ago. Their development center (or at least, one of them) is in St. Petersburg, Russia, and their offices were near by those of a company I worked for at the time. When I wrote and told them I'd be in town, they invited me down to their offices for a visit. I had a grand time talking with some of their developers. Since it was Russia, of course we also had vodka and chocolate :)