Best Dungeon / Map-making systems?

Just as my title says, I'm curious what systems if any you use to generate dungeons or maps for encounters/Points Of Interest/etc.

I use graph paper and like to make schematics before I send my parties in. If I know I need a minimum number of specific rooms, I'll make those from the start. I just don't put in loot or monsters/NPCs on the map, I'll use physical tokens and then roll for that when a party member goes into that room. It's kind of a fun bit of prep that I'll do.