Linux has wide selection of professional software. It might be software that you do not use, but they are there. Hell, the software you recommended, Eclipse, runs on Linux!
I meant 'professional' in the sense of payed-for, close-source software. I think the open-source scene is really amazing. However, I like the support that OSX has from the professional software developers, something that simply has not yet occured in the Linux arena.
That's why I said I like OSX, because I can use Eclipse, Gimp and any other open-source software and at the same time run Photoshop if I need to...