In fact, for the average person, I am not sure a post-it note full of passwords in their home is a bigger risk than an online password manager. Sure, if someone breaks into their house they are screwed, and that is a relatively easy attack. But on the other hand, any bulk breach leaves them unaffected. A notebook full of plain text passwords in a drawer in your home and a shared memorized prefix that must be combined with the passwords on the list to get the full password seems strictly more secure than a password manager (although slightly less convenient).
This actually sounds pretty good; I might start recommending this to non-technical friends and family.
EDIT: phone auto-completed "non-technical" to "non-profit technical"