PF, no I haven't. Be hundreds of others have, some with their carry-on. And nothing suggests those actually representing a danger to themselves or those following.
Yes I know it sounds right, but that's what everyone said before they lifted the ban on using small electric devices on the ground.
I think it would be better to realise that, for whatever reason, passengers will continue to do this. Rules, and procedures, should be developed in that knowledge to mitigate what could happen. Sticking ones head in the sand is OK for ostriches, but not an intelligent species.