So I made a map of this old fortress world I made a long time ago:
Cartographer:

Ingame Map:

It's better than I imagined it would be, it actually gives a hint as to elevation. Its not perfect, for instance, the south east just looks kind of bumpy on the map, but as I was mapping it, that area killed me due to it being composed of Minecraft's trademark sheer vertical cliffs. The worst part is that its zoomed out very far, you cant even make out my fortress! It only shows up as the gray blob under the player arrow. I have not found out how to create a more zoomed in map.