The reason the pressure carb is relatively ice-free is that the fuel is introduced downstream of the venturi. In a float carb it's sucked in right at the venturi, where the ice tends to form.
My father experienced a carb-ice forced landing at age 92. To him it was no big deal - he was on downwind so he just made a shorter pattern, and planted his 65hp T-craft right on the numbers. After all, he learned to fly when forced landings were commonplace.
