yes, facing clickers is freaking scary, but at first, later on you will learn sneak past them very easly.
But i want to point that ND created really believable parasite, with all the stages the infected is going through - it seems reall and creepy as shit
don't want to spoil, so at some part of the game a kid ask Ellie what she thinks when someone is infected, maybe they are conscious but can't control theirs body - and look, runners are crying all the time, even when attacing and eating someone they still cry and sound like very scared, sometimes screaming but that sound like crying for help rather than screaming in that scary type. After turning in to clicker i think you are dead as a person