I love this topic! I have kept my animals in live/bioactive vivariums for several years, both because I think they help maintain humidity and I personally like how they look.
I have never put drainage layers in mine and personally think those work better for super humid species like dart frogs. With that in mind, all of my tanks start with 6" inches of organic potting soil and then I plant pothos in there. There are some websites, such as Josh's Frogs, where you can get plants that haven't been raised/cultivated with fertilizers and insecticides.
I use UVB on my adult breeder tanks, and I think that helps with the plants too.
The core vertical elements are cork, but I've also spent a lot of time in my yard and local forests finding right-sized branches. I bathe these in a bleach/water solution, then let them sun dry, then bake them in my oven for 2-3 hours at 250 degrees.
Day to day, of course the tanks get misted heavily. Roughly every 5-10 days, I dump in a liter or two of water to make sure everything is humid enough, but other than that, they're very low maintenance and easy. Isopods definitely help with the cleanup!