I used to have a Happy Hacker keyboard and write Java (and other languages) in a customize emacs environment. These days I use a regular mac keyboard (so I can easily transition between my macbook and desktop setups) and run IntelliJ. And I feel like I'm a whole lot faster writing production-quality code. There are definitely a few annoyances when using the IntelliJ emacs key binds, but this is more than compensated by being able to do things like automatically download and jump to referenced packages and having the IDE suggest code improvements ("I've noticed that you could be using the Java 8 lambda syntax here..." / "Do you want to remove these unused imports" / "This value may be undefined"). And now I can't write Java without IntelliJ, and I'm going to fail my next whiteboard interview ;)
I use a Happy Hacker keyboard in a customized emacs environment, but I'm pretty much Linux only, so no issues with transition between laptop and desktop, although I do have an older Thinkpad and the layout is slightly different, but not enough to screw me up. I cut my teeth on Sun Sparcs, and haven't found a layout that I like better. In fact, I actually have two keyboards; one for home and one for work, and the latter has a lot of "mileage" on it because it regularly travelled with me from New York to Hong Kong.
