This one is maybe even too obvious for the article, but: share your passwords. Even if you are the only developer on the team, you should not be the only one with access.
Also I like to think of this methodology as “what if I got amnesia tomorrow?” You need to get everything out of your head onto a shared knowledgebase.
I agree in spirit but would revise: it's a security threat and against some company policies to explicitly share passwords in the clear. The ideal is to add your password to a corporate password vault, some of which can then authenticate for coworkers without them knowing explicitly what it is.
Also I like to think of this methodology as “what if I got amnesia tomorrow?” You need to get everything out of your head onto a shared knowledgebase.