Actually my screen is not large for any particular pleasure of mine like CGI or games or whatever of the sort, it's just that I can then fit a lot more code horizontally in it and it then makes my work easier (I get annoyed at programmers who wrap their code around to fit on 800x600 screens, it makes the code more annoying to read, to me that is). That's also why I had tried 2 screens, then it was awesome - I could write really large lines of code stretching from one screen to the other, this was useful for some features I used.

But like I said, the problem with 2 screens it that it becomes kind of a gadget, as you can then drag windows from one screen to the other, decide what opens where etc etc. And I ended up wasting a lot of time shifting things around, which I didn't do before that (I'd then -and now- just pile things on top of each other).