We are using assessment in two portals,
http://www.lerntransfer.at/gfp/cycles and
http://www.evaluate.at as a survey tool.
Based on this experience I would love to see an assessment UI that distinguishes between survey and assessment at all levels (assessment, section and question), because now have to take out the assessment specific elements for our clients "by hand". However, I do not see a need for a more detailed distinction at the moment.
BTW, why not calling "Assessment & Survey" instead of "Assessment". Could be that a majority of usages are in "survey mode" although this is not reflected in the name.