Your idea is fine, but you don't need drawing skills to make a nice map. Check out the Arr-Kelaan free hexmapper software - requires zero talent, & makes maps like the old Mystara/Gazetteer ones:
http://home.paonline.com/zaikoski/ak/TOOLS.HTM
Personally I think flowchart style maps are particularlt good for cities, labyrinths, and other very complex locations. They're particularly good in PBEMs - if you run a dungeon in a PBEM you don't want to waste time on "We turn right", "We take the left fork" etc, just the important stuff.