How potent are the Anti-Ice Heating for sensor probes on aircraft?

The heating unit on Pitot tubes can heat them to the point that you can burn your hand on them. But it does no good if it's not turned on. I speak from experience - the first time I encountered icing I first became aware of it when my airspeed indicator went to 0, which reminded me that pitot heat should be enabled anytime there is visible moisture.

If you wait too long to turn on Pitot heat, depending on the design of the pitot, ice build up that starts on the pitot can reach the point where part of it is attached to the unheated part of the airframe -at that point pitot heat will melt the ice on the probe, but not the rest of the ice, which could still be blocking the airflow to the Pitot.

I've been flying since 1988, I've never heard of "crystal -icing" -it's not notorious, it's fictional. There are 3 types of icing: rime, clear and mixed.

Airframe icing does not occur in the manner most people would imagine - it does not look like the ice you see after an ice storm. It builds up on the leading edges, forming rough shapes. If you search for "airframe icing" most of the photos a bogus, showing icicles hanging from wings - that only occurs when the plane is on the ground. Here's a real photo of airborne icing https://flightsafety.org/wp-content/uploads/2017/0...

Heated probes are hot enough to blister and burn your skin if you touch them with your bare hand. The primary purpose for them to be heated is to keep ice from forming on them, but they have to be turned on (activated by the pilot) in time to be effective. Once a coating of ice actually forms on the probes, it's hard to remove it with just a heated tip.