I almost never use battlemap, but sometimes I prepare map, as they help for more than just combat. A map of the crime-scene sometimes really helps the PC figuring out how the clues say something about the story. Knowing how dorm are organized in the university campus can really help when you want to play campus drama. Thinking about how the "servant can bring food from the castle-kitchen to the ballroom* suddently means that you have a whole network of small corridors which can be used for an infiltration.
And then even though I suck at it it's sometimes quite fun to do