My own experience of carb icing when taxiing always occured on grass and so issues about debirs ingestion are not really important. Damp grass in the morning would stop my C90 in less than 3 minutes.... Without carb heat the Gipsy often would not run at all under similar conditions
Apart from tropical conditions I cann't think of many places (short of a dry beach) where dust or grit would threaten an engine that much.
However Gipsy Majors are recommended to use hot air in dusty conditions (the air routing tends to throw dust out of the airstream into the carb) - but they are a bit of a rarity as GA engines go these days!
One of my friends has a proper carb ice detection (its electrical but visually detects the build-up of ice in the carb). The engine is an O-320 and it rarely causes concern from icing but the gadget does give a much better early warning than anything else I've seen. Its called a LAMAR Ice-MAn - I think!