Yeah, the Qt tools on Windows are pretty good -- integration with Visual Studio only works if you have the full version, not Express, though. And Qt Creator on Windows is very usable. Now, admittedly, setting up KDE in addition to Qt to work with on Windows can be tricky. The best way is to use an emerge-style source based installer that creates a whole environment to work in (http://techbase.kde.org/Getting_Started/Build/Windows/emerge). It's a cool environment, and an amazing achievement, but right now it's involved enough that it takes me about a day to create a full new development environment. And I have been doing that a lot lately, since for some reason Windows partitions, laptops and vm's keep getting corrupted.
However, I've never ever had a Windows developer come up to me and ask to help him get started, so I think that the basic interest just isn't there. I have a suspicion that the idea that you can, like develop software on your own, is not very current on Windows.