When I was still using Windows I was using corel draw. I still believe it was (and I suspect still is) the best vector drawing program for more technical drawings. Just one example:alignment is really deeply build into the system using a set of keyboard shortcuts so instead of always going to the align and distribute tab you just pressed "e" to align the previous object. It was really so much faster for drawing than illustrator or inkscape.

Unfortunately there is no Linux version otherwise I'd happily buy it.