In the office I use Microsoft Visual Studio and Eclipse for the C++/Java development. For developing Dolphin I used an editor and the shell, but honestly speaking in comparison to an IDE this is very inefficient especially when it comes to debugging.
After reading Qt Creator, CMake and C++/Qt Development I gave Qt Creator a try and was highly impressed. Although it currently cannot compete with the functionality of an IDE like Visual Studio or Eclipse it is a pleasure to work with Qt Creator. The user interface is very clean and polished and I have high expectations for future releases...