Unclutter - This gives you a nice non intrusive "memo zone" as well as manage your clipboard, so that copying password won't lose your user name into limbo.
BetterTouchTools - Who'll live without this one? Just give "three fingers swipe down" mapped to cmd-w and your life will be quite that much better. No more click at the upper corner tiny button to close a window which is an insanely dumb usability. Add several more to your likings and your life is even rosier.
And use a password manager, so that a new login made from your phone will be on your mac without effort and nothing gets lost on clean install even if you forget to export them if they're saved in the cloud, not to mention you can have randomized password for every site, but make sure to secure the master password with 2fa.