I gave a talk to a branch of one of the engineering institutions near Birmingham once. I briefly mentioned carb heat as it's fitted to little aeroplanes. The resulting question and answer session left me in no doubt that Engineers (at least ones who live near Birmingham and go to evening lectures) who design and test cars and especially motorbikes spend a lot of time worrying about carb icing and what to do about it.
Interestingly nobody had ever tried the coolant-loop type carb heat you see on a lot of the newer Rotax 912 / 914 installations.
G