Ball pythons like it.
Anyway, I think that if there's dew on the inside of the tub, then it's too wet, and you're risking all sorts of potential health problems.
If you like the stuff, and the snake likes it, then offer a 'moist hide' with an appropriately sized hide box with a little of in the bottom.
Dew doesn't show up all the time, but when I had a rack with back heat in a cold room the hot side would evaporate the water out of it, and it would condense on the cold side wall.
That being said, I think that corns would be more comfortable with a touch of added humidity, as they regulate their humidity in the wild, as they don't always have a ready source of water in the wild. So while it does make them more comfortable in that they may need to drink less, balance that against mold, possible bacterial growth, possible RIs, and it's just not worth it unless you have unusually dry conditions, shedding problems, or the like.
If the snake is in an aquarium with a screen top, then it's good to offer a humid hide box in dry weather, but too wet isn't good, either.
People have been keeping snakes on aspen/hemp/sani-chips for a long time, and those seem to be the most trouble-free for the keepers, and offer the snake a clean place to hang out. While it does seem too dry at first glance, remember we offer them constant access to water, something they don't always have in the wild. If you offer a corn a humid hide, they seem to like it a LOT, and hang out in there, but they're just trying to regulate their humidity, and conserve water, thinking that it's not gonna be available. (But we know we give them constant access to water, so it's ok to keep them a little dry.)