Don't you find it annoying having to switch to a terminal to log in to a site in your browser? I personally love LastPass. It's free for my use case and there's plugins for popular browsers, mobile apps, and a CLI app if you really want it.
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The community has even produced a cross-platform GUI client, an Android app, an iOS app, a Firefox plugin, Chrome plugin, a Windows client, a pretty Python QML app, a nice Go GUI app, an interactive console UI, Alfred integration (1) (2) (3), a dmenu script, OS X integration, git credential integration, and even an emacs package.
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If this weren't the case, I'd agree :-)