I've always liked salamanders, eels, slugs and snails, which are slimy. But a snake is a different beast. My carpet python is over five feet long and likes slither in my hair. I have no idea how I would wash that amount of slime out, and shampoo is pretty expensive.
I prefer pets that don't require high humidity, as my apartment is very dry and I find trying to maintain a humid yet clean environment very high-maintenance, personally. If snakes were slimy I might have one, but definitely not six.