I haven’t either but I’ve been tought to only use it in visible moisture or below 5°C. Our manuals don’t say anything about it specifically but the Cessna POH mentions to turn it on when inadvertantly flying into icing conditions, the checklists say “as required”.
I could imagine that they teach it so to manage it purposely and don’t forget to turn it off. You can really burn your fingers and I guess it’s not healthy for the probe to overheat on the ground with no cooling airstream.