Although in the past I used them, now with so many snakes it would be impossible for me to keep track of humid hides; so I never use them (unless a snake has a shedding problem). The only time there are shedding problems is in the winter, when the humidity is lower, and then the number of problems is really very small (well under 1%). I find that all of my snakes use the water dish for moistening the skin prior to shedding. I think that absent a humid hide, the snakes have become conditioned to getting along without one.
Mark