Narrow corridors

It would be rare to have an encounter entirely in one long thin corridor, certainly if you have no ability to teleport or fly to get behind the enemy it could also be less than fun.

In general I'd expect corridors to be branching off rooms the encounter is intended to mostly occur in, or if intended to be encounters, a series of intersecting corridors with intersections.
Even a long winding corridor would be hard to make fun unless there was a gimmick, like a trap that's steadily collapsing 3 squares of corridor per round.