In Xorg -- the graphical environment used on a lot of Unix-like operating systems like FreeBSD and various Linux distros -- middle clicking anywhere you can type text, whether that be in a terminal, in a text editor running in a terminal, a standalone text editor, an e-mail client, an input field in a web browser, etc etc etc, will paste the text you last selected. Once you get used to that you will wonder why every OS isn't doing so by default. It's pure genius plain and simple.