I think it could be interesting if it were a battle map, rather than just some terrain you have to traverse. E.g., you have to lead your troops on an assault against the bandit stronghold, and the only approach is a narrow mountain pass leading up to a cave or something. It would be pretty intense too, since you just know they'd be standing on the nearby ridges throwing javelins and axes down at you.
Actually, now that I think about it, I could also see this as something that might take you from one major area of the map to another. E.g., right now the map is surrounted by impassable mountains on three sides and the ocean on another. If you wanted to expand that map, you could put a mountain pass somewhere around there leading to a different region, where there might be new goods for trade or new units for hire. It would also make a good place to encounter new NPCs, and yes, a good place to be ambushed by bandits on occasion.
But please, no hidden crevasses for people to fall to their deaths in. Assuming you have a train of soldiers on foot and on horseback behind you, I can just see them all plunging lemming-like to their deaths in their efforts to pathfind their way to your location.