I agree about the separate download... I develop QT/C++ stuff sometimes. I develop in Linux, but I want to build executables for Mac and Win that I can distribute easily. There are different ways to do it, but last time I tried it, I got best result when I compiled QT myself, and then my Application against that QT build. (Perhaps at that time, it was the way to build pure 64-bit executable on Windows). So, yes, I just need the compiler, not the GUI.
But nevertheless it is good news that 64-bit tools come with Express.