Passwords. Everybody hates them, but everyone still uses them.
While there are pushes for certificates, OTP, and other forms of authentications, the password is still king. In addition to the ubiquity of passwords, good practice dictates that we use different passwords for every account silo, and (controversially) we are supposed to change them often.
Most corporate environments use a single account silo, and the use of single sign-on systems has the promise of not needing to authenticate regularly. However, most of the time, these systems are more consistent sign-on instead of single sign-on, so you end up typing your password over and over again. On the plus side, this is convenient in quickly updating muscle memory following password changes.
