PookaMustard: IE11 is simply the best version of IE out there. So I simply don't know of any reason why you'd stay on an older one other than maybe your Windows version isn't able to get any higher than what it got. But even then, as someone above said, IE11 is living on borrowed time as Microsoft Edge gets to mature over time. That or they will keep IE11 in future versions just to keep legacy code in check, and also perhaps because I heard that a part of Windows rely on IE11 for things, though I'm unsure about that for Windows 10.
drmlessgames: Isnt Edge just IE with a slightly more robust IE engine?
No to my understanding it's got a massively refactored version of Chakra (the JS engine) and instead of Trident they are using EdgeHTML.
I remember being surprised with some reasonable developer tools in IE 8, not long after it came out. That was a good start. 9 was less of a headache to develop against, but then again jQuery came on the scene and plastered over all of the nastiness of browser bugs like that.
Will I miss IE? Not a chance. It wasn't *as much* of a disaster as, say, IE4 or IE6 though... faint praise though.