My Dad passed away with no will and no instructions on what he actually had and where things were. This would have saved us an incredible amount of time and pain right after losing him.
These aren't exclusive. If you're going to write a "just in case" document supplementary to your will, it can have whatever useful things certain people will need to know AND whatever interesting works you want them to remember you by.
Same. Though Lastpass' ability to request a trusted user's passwords (with a configurable amount of time to deny the request) obviates a lot for my wife if I were to pass.
I think that's a great use case. I have something similar set up with a deadmans switch in Gmail. I don't want people to have to go on a hunt and have to hack into my gear while mourning like we did. No fun.