Since I've been Windows XP daily for the last two and a half weeks, due to my new job, I've come to appreciate KDE all the more. I was actually expecting to adjust to using Windows pretty quickly (I haven't regularly used Windows for over five years) - after all, Microsoft throws millions of pounds at it, so it must be a good system, despite what people say. But every day when I come home and boot back into Linux, I'm amazed at how much better nearly everything is. Admittedly, there are a few things from Windows I'd like to find in Linux, but there are far more things I want take take from Linux/KDE and put in Windows. Even simple things like resizing a window - I'm so used to pressing Alt+right-click to resize that I find it quite annoying that I can't do that in Windows. (I'm quite expecting someone to tell me of an addon which does this now.) And KDE just feels more solid to use, and more streamlined, and more productive and slicker and faster, and all-round better. Yay for KDE!
I'm looking forward to version four. I've been keeping an eye on SVN and things are looking pretty cool. It's still too much of a moving target for me to contribute at the moment (I don't have much time at the moment as I have a new job, and need to be learning about work code rather than KDE code right now), but I'm quite excited about the future of KDE.