By "significant" I mean useable - mainly because I've been lacking the inspiration, and my latest game idea doesn't lend itself terribly well to maps, which is a bit frustrating. Maybe I'll get round to creating some small maps once it's going.

CC2 is a bit difficult to get into, but having played with it a little I think you would get the hang of it before too long if you're strongly motivated enough to make a map. It sounds like you are, though I've been falling a bit short.