After watching the huge amounts of insects break down my compost, I'm certain their dead bodies are something my plants love. My bins(tumblers) sit above ground level so its mostly flying insects for me but some ants and potato bugs and other ground dwellers make it in there too. No worms though, due to the nature of my set up. Its a tumble compost and I usually let them break down the entire summer and extract during fall. When I did have my compost on the ground I would say my fungus levels were much higher as I could see when I brewed my tea more than a few days and the results would put mushrooms in my pots.