I can understand how the carb ice forms, with the venturi effect in the carb intake dropping the temp of the air dramatically etc, and having read about carb icing incidents on the AAIB site and in the CAA GASILS (all thankfully available online), I for one will certainly be getting into the habit of a good 15sec+ burst of carb heat, at least every 10 mins, and 'always on' on low power settings eg descents (apart from low power on the ground, due to the unfiltered air).
One thing I wonder about though. I'd never heard of carb icing before taking up some flying training. In the 'good ole' 70's, when only the expensive cars had fuel injection, how come it didn't happen in normal auto carburettors - since they have venturis also? Suppose they must be diferent design to the aero carbs?