Especially having two buffers is a productivity booster, if I would count how many times per day I take some data from a source window/view with ctrl+C and another one with selecting it, then pasting one of them with ctrtl+v and the other one at the correct position with middleclick it would be quite alot. Like I just did with this text. Then I have klipboard which keeps both of the buffers in a history, so awesome Im baffled how my collegues at windows can even do their job.

Especially useful in terminals where ctrl+shift+c/v is awkward to press compared to a middleclick.