Well .... To be fair I'd say that SOME do benefit from a soak .
My first Royal ( albino ) was in pretty poor condition when I 'saved' it from the local pet store and she wasn't happy or wanting to eat for a few weeks afterwards .
I posted a photo of it onto a Snake forum and within hours somebody suggested that she thought it was probably dehydrated and to give it a soak in water for 30 minutes . I did everything she said and within the hour the snake had transformed into a plump brightly coloured Albino .. and she ate the very next day ...
Was the OP asking about rehabilitating a dehydrated snake?
Or was the OP asking about just hanging out in shallow water very so often?
With regards to dehydration, there are better ways to address it than soaking the snake in water.