There was a long time when the middle mouse button didn’t do anything, because the standard PC mouse was 2 buttons. I had a Logitech 3 button mouse where the middle button didn’t get much use. In I think RiscOS it had a function, then there are some actions like “both click” where you click both left and right buttons at the same time, which is sometimes also implemented as middle click. In Linux, middle clicking pastes from the primary buffer. And when you know what that means, it’s actually pretty damn handy.
There was a long time when the middle mouse button didn’t do anything, because the standard PC mouse was 2 buttons. I had a Logitech 3 button mouse where the middle button didn’t get much use. In I think RiscOS it had a function, then there are some actions like “both click” where you click both left and right buttons at the same time, which is sometimes also implemented as middle click. In Linux, middle clicking pastes from the primary buffer. And when you know what that means, it’s actually pretty damn handy.