Not insane - perfectly normal! I generally say my checklists / FREDA / Landing checks etc. out loud if on my own, even with pax if I think they're interested. The more you say it out loud as a matter of course, the more easily you can hear "yourself in your head" - if you know what I mean - when you want to do the checks silently (perhaps with nervous pax who are nervous of everything that they here... e.g. "gear down and locked"... "what do you mean? whats wrong with the gear?")
Andy