I guess somebody could ask me the same thing. "Don't you get sick of taking picture ALL DAY??"
I would reply "No, each person is different, their personalities are different, their teeth are different, and their situations are different" (Okay maybe I wouldn't say that about their teeth, but you get the point.)
This particular family is so fun to work with. Mom wants pictures of her kids.. HER KIDS.. being them. She even asks me to stay VERY minimal on the editing. So I do.. I may brighten them if they need it, but not much more than that. It's a fun change up. And since she isn't worried too much about posing, these session are always relaxed and fun.
