The UTH kind of works -- it's just not as effective. I'm using one on my cold side for that right now, since it's pretty chilly inside. I'm hopeful that this new dome I have will allow me to remove it.
On the CHE side, that's basically the short of it. It doesn't have the humidity issues of a tank because only that small area beneath and about an inch around the CHE dome is a screen -- the rest is still plastic and holding in humidity and heat for you. You're still going to be using higher-humidity substrates, and turning it over every week or so, but I've never had to mist.