Maplex has a nice feature which can abbreviate labels based on a dictionary that you configure. eg, replace STREET with ST. However, it seems to be an all-or-nothing setting, with Maplex always ...
Using either the standard ArcMap labelling engine, or the Maplex engine, it is possible to automatically omit labels from the map when the area is too congested. Eg in the centre of this image, ...
I am mapping an area where there are a lot of overlapping features because of certain Oil & Gas wells being drilled within the same geographic area, but to different depths and maintained by ...