What goes through your minds? Do you think germs will roll off in the water?
It's 100% pointles and more counterproductive than anything else. Touching the taps that some guy who's just had a poo has used to wash his.
If there's no soap, I don't wash at all. I'm more confident about the cleanliness of my Johnson than the taps in a work / public loo. You should be too.