If you create your own maps digitally, what do you use as map-making software?
Personally, I am fond of Inkscape, as it gives me maximum flexibility and the vector-based approach is great for scaling and rotating things.
I use Gimp and just hand-draw everything. I've learned that players don't really care too much about maps, so going above and beyond with high quality, ultra detailed stuff is wasted effort unless you derive joy from the creation process.