This is a throw-back to the 1980's, when I had to type in programs from computer magazines and books.
I remember those days. It can certainly be painful to have to type in a program or example before you can try it out. The only advantage I've ever found to the process is that by the time I'm done typing the program, I really have a better understanding of what the script is supposed to do. I'm a slow learner and the typing process somehow makes a connection between my fingers and my brain and I understand things better than when I just cut and paste. If I find I'm typing something that I don't understand, then I can go and look it up.
Now if I could just get a handle on those annoying typos....