No, I just put my terminal into a mode where I could see what I pasted without any possibility executing it. If you don't give cat any arguments, it reads from stdin and writes to stdout.
I could have just as easily opened vim/emacs/notepad and done the same, or for that matter, written the contents to an actual file instead of redirecting the contents to /dev/null.
I could have just as easily opened vim/emacs/notepad and done the same, or for that matter, written the contents to an actual file instead of redirecting the contents to /dev/null.