The “Accounts” settings and the “User accounts” control panel have similarities, but Microsoft has rolled the most basic functionality (add and deleting users) into PC settings while removing it from the control panel.
I can't tell you how much this frustrates me. To manage users, you now have to go to two different places in the system. The desktop applet won't do everything the Metro applet does, and the Metro applet won't do everything the desktop version does... talk about frustrating!
Fortunately, the old Local Users applet is still there in Computer Management (at least on the Pro version); that's where I've always managed users, and I don't foresee changing that any time soon.