The reason I was saying to do the surface matching in the way that I specified was along the lines of what Jean was saying:
EnergyPlus doesnt actually duplicate the multiplied floor, it just multiplies out the loads. from a solar standpoint, (I think) it just makes the zone x number times bigger in the X and Y directions. for this reason, if you match a multiplied floor surface with a non-multiplied floor surface, you will get errors due to non matching floor areas that do not satisfy the conservation of energy. therefore if I use a floor multiplier and want to match the floor and want to account for heat transfer between floors, I want to make sure that my multiplied floors ceiling is matched to the multiplied floors floor.
Since the ground floor ceiling and top floor floor are not being multiplied, they make a good match for each other IF the loads / temperatures are similar to the rest of the building.
As for visual display for presentations, I agree with Jim that it's helpful to duplicate the multiplied floor in order to take a screenshot image that looks like the real building without multipliers. Sometimes with detailed models it is helpful to just duplicate the perimeter and plenum zones so as to not bog down the GUI (openstudio, designbuilder, etc)