I've only had 2 experiences with carb ice.
The Continental C65 has a reputation for attracting the stuff, and I got it one cool, wet day on a protracted taxy out to the runway. Started to lose power nearing the hold and couldn't figure out why. Thought I'd try the carb heat and, wouldn't you know? That cleared it up.
The other recurring problem was on my Harley 1200 Sportster. In the cool, wet days of autumn, it would ice up and stall the engine but would restart again after a few minutes. After a few times of this I asked the dealer and they suggested carb ice. It had totally slipped my mind that it was a possibility, but on the V-twin, the carb is on the side of the engine and enjoys no heat from the cylinders at all. Harley sell a fuel additive that, when added to the tank, did the trick. No problems after that.