Do you have any studies to base than on? Because I believe the opposite.

The mouse is a nightmare: First you have to find it on your desk or whereever you happen to work. Then, you have to focus on the screen and try to find that tiny little arrow. Finally, you have to coordinate movement of the mouse and arrow to click somewhere.

We are very used to it now, but it's a nightmare anyhow.

I don't even start about the trackpad!

How much easier to just stick your finger out, you don't even need to divert your eye's attention from the screen. Its natural. It fast. And your and fall instantly back onto the keyboard.