See for yourself, in 10 seconds.

Can you fly a plane?

Software, to normal people, looks like the picture above.

You're a bright person, but you probably can't fly that plane any time soon. What do all those controls do, what do their labels mean, how do they go together, which do you need to use and when, how do you use them, what feedback do you look for, what happens if you hit the wrong thing,...?

Even if shown how to do something basic, like drive it up and down the runway, would you remember it all the next day? If you'd got one bit of the entire sequence wrong, and the plane wasn't moving, how would you know what to do? If a new light started flashing, what would you do then?

Take a look at your PC screen, and imagine you're not a "computer pilot", i.e. that you don't understand what almost any of those dozens and dozens of buttons and words mean, or how they fit together, or which you need and when, or what happens if you hit the wrong thing, or... ...Now you're seeing what normal people see, on their PC screens.