Me. Admittedly, it's stupid as hell, but has generally been too much of a pain to do anything else (for things outside of banking, email). I've started to get serious about KeePass lately, but I bet a significant percentage of users take the lazy approach.
Having to type in my Apple password on iOS once every few hours inevitably means I have to use something memorizable and quick to type. There are certain trade-offs with different passwords.
I've developed a system (kept only in my head) where every password I use is based off on the name of the service. This means that with just one of my passwords, you're most likely not getting anywhere. With two, you have a bigger chance of figuring out the differences and thus the system, but it works fine for me at the moment.
Don't underestimate me. It contains many numbers extracted from the letters according to various rules (order in alphabet, backwards, etc), along with special characters.
I take things a step further -- I have no idea what my password is on sites like HN or reddit. If the cookie is ever gone, my account is gone.
I don't like the idea of identity permanence.
Instead of shitty passwords though, why not use something like 1Password to store the logins? I use that (or an old fashioned piece of paper in a secure location) for meaningful security tokens.
Ha. I'm in the same boat. This is my second account after the first one got ghost banned (for a single comment and the followups attempting to explain).