I don't think I've sunk as much time into any other mechanic in the game as I have with the map. Especially with mods like draw on map and map symbol size changer to do fine details.
I end up using the map for everything, like to-do lists, shopping lists, route planning... I have no idea how I used to play this game before and I never want to go back.
Not to this extent, but I'm still under 100 hours of overall gameplay (only on like my 7th death). I just mark houses I've already looted, particularly large hordes to avoid, and resources I can't take at the moment but plan to come back for later.
It's cool seeing what other players do though. Thanks for the inspiration.