My background is in video compression and OpenGL. I was a SodiPodi user and switched to Inkscape shortly after the fork. I have used, and continue to use Illustrator and a variety of CAD systems for vector editing purposes and simply to ponder their workings. Currently I use Inkscape to do most of my drawings for school.
I have my own page about Inkscape at http://dracoquies.us/cira/comp/inkscape/inkscape.html
I love the elegance of Inkscape and prefer it's node display and editing mechanism greatly over Illustrator's. And frankly, Inkscape is now so mature that I don't really see the point of attempting to follow what any other program does. It is now its own thing and must forge ahead to find its own path.