Sometimes there are policies that made this almost forced. Case in point: the company I work for forces you to change password every 60 days max. They don't allow the use of passwords managers and you can't use the last 5 passwords. So what do people do? Just go with a simple word and change one number each time. Like "velociraptor1" then "velociraptor2" and so on.
I use passphrases which let me remember them easily while offering protection but it's so stupid that they do it this way.