While I won't deny the 'Macro' feature of zoom lenses more is a figment of the imagination of a marketing department it should not be entirely dismissed either.
In a pinch, the 'macro' settings provided by AFD 35-70/2.8, AFD 35-105/3.5-4.5, AIS/AFD 35-135/3.5-4.5, or 50-135/3.5 , have brought me the extra "mile" required to get the shot I wanted. Of course image sharpness in particular towards the corners will be no match for a real Micro-Nikkor, but having the picture is far better than missing it completely.