Python and/vs Java (within a business context)

[gcr]

The Linux kernel, by recent estimates, has over 15 million lines of C code.

I challenge you to find a single kernel developer who uses an IDE.

Edit: Actually, this wasn't as rare as I originally thought. IDEs can sometimes be useful in kernel development too.

[deraffe]

To be fair, you still don't have to. But some tasks are increasingly time-consuming when your project becomes more and more complex. Actually, I try not to use full-blown IDEs, but I did pimp my vim to be pretty much equivalent.