Never has for me, I just go out to find the thing frozen in place in the mornings
I don't even bother, just plug the troughs in to the mains.
There were a lot of quite inventive methods discussed, tried and used a month or so back.
If you are breaking ice, use an axe or something sharp it is far more efficient and MIND your eyes, ice shards hurt! Removing the broken ice (use a sieve) and topping up with hot water helps. So does insulating the trough from the wind.