I ran a session of Northern Marches last night where a small party of adventures investigated a small dungeon below a ruined temple.
I ran the entire dungeon without a prepared map. I quickly made up a list of creatures that I thought would be present and used tables from Dungeon Bash to make the dungeon as we went.
This brought up a thought... Are dungeon maps necessary for the enjoyment of B/X Dungeons & Dragons?
Would it instead be possible to use an abstract system for goal driven scenarios, such as that from WarpQuest?
For example, the party in my Northern Marches game is looking for some clue or evidence as to what happened to a witch that might be able to help with a disease outbreak in a nearby village.
For an abstract system I could mark off 30 squares on a piece of graph paper. Square #1 would represent the dungeon entrance and #30 would be the goal (in this case the clue). Roll a d6 and mark off that number of squares on the graph paper and have an encounter (monster, trap, whatever). After that encounter roll another d6 and move that many squares on the graph paper and have a second encounter, etc. When the party reaches square #30 they have reached the Big Bad End Guy and the goal.
A larger example of this is the Palace of the Silver Princess Warp Quest Module. The mechanics don't match B/X so it would have to be adjusted but it is illustrative.