Umm not really, maybe my choice of words was bad. What I meant, is that creases do not add any additional vertices or faces, rather the define shape of the faces will be interpreted based on vertex location and the type of creasing selected. Creasing will show in the modeling window.

Bump mapping is post render "effect" that simulates depth/height on a surface and a bump texture to be assigned to the material's shader. Creases are a modeling feature whereas bumps are rendering feature.

Clear as mud right?