I feel Inkscape has a great UI, too. I never used Illustrator, which seems to be the benchmark for "semi-pro" use of such vector graphics tools. The GIMP I use

I feel Inkscape has a great UI, too. I never used Illustrator, which seems to be the benchmark for "semi-pro" use of such vector graphics tools. The GIMP I use because I'm used to it, but I find the interface a little annoying.