If that observation were the reason for thinking/practices, it could be argued that it is the opposite of (safety-related) electrical common sense ...
That's the reason why I wear a hat, I was told, as he used his hat to turn on the light just after I got a belt, was a barn not a bathroom, but switches have improved, condensation was a problem.
I think in this case train is appropriate.
Those sensors often don't save electricity.
OK - but, as I presume you will have understood, my point was that you would not 'get a belt' by touching a piece of properly-earthed metal (and not anything else 'live'!), no matter how much condensation was about, whereas some believe that there is a risk of a shock if one touches an electrical accessory which is NOT earthed metal (i.e. plastic) if it is covered in condensation!
Primarily because the 'sensors' consume a little electricity 24/7, potentially as much, or even more, than what an LED light would use (particularly if one usually remembered to switch it off when not reequired).
Another issue about lights controlled by a movement sensor in a bathroom is that people not infrequently remain relatively 'motionless' (e.g. in bath, or even sitting on loo) for long enough to get 'plunged into darkness'. I know a good few people who have installed motion detectors in bathrooms (and some other places), only to remove them fairly soon because of this problem.
And don't forget there are electronics in there, powered 24/7.
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