I've always typed stuff. Even when looking up code snippets for stuff I don't know how to do, unless I'm super constrained by time I type it down instead of copy-pasting. It really helps committing it to memory, and it's how I learned how to program as well.
I never thought much of it other than the fact that I liked typing stuff when I was learning to code, but years later, when I came across the "Learn the Hard Way" series of books by Zed Shaw, his request to never copy-paste anything in order to help you understand what you're doing made a lot of sense and explained my behavior as a kid.