[lostcolony]

Chrome syncing browser plugins with a password manager makes personal desktop/laptop, and office desktop/laptop pretty trivial (barring, yes, overzealous IT).

Cellphone and tablet I install the relevant app once and am done.

Either way, web access to the credentials isn't uncommon, though you'll need a device for 2-factor confirmation it's you.

For family devices...I wouldn't want to log into them. I don't trust their security sense and don't want to risk compromising my stuff because of their mistake. Why would I anyway; I have my cellphone on me, at minimum; I can access the account there.