I'm surprised to see "platforms" as Win: 41%, Desktop Linux: 33%, Mac: 18.4%. Presumably this question was about the machine you use to develop software on. The reason I'm surprised has nothing to do with any advocacy. It's just that whenever I look around at a non-Apple dev conference in the US (Web, for example), it looks as though fewer than 1/5 of the machines are NON-Macs, while the answer to the question above…
StackOverflow is more tilted towards "dark matter developers"[1] than many other places - the unseen, the unheralded, those that are toiling away at LOB apps inside of companies. Often they're using PHP or Java or C#, or god help them, Visual Basic, still. Those are not necessarily the kind of people that are going to be seen at dev conferences, but there is a huge number of them, and they use StackOverflow hard. [1]…
After all, you consider C# an uncool language.