One major thing that I've noticed--
There are two main types of children's librarians: those who mostly notice the misbehaving kids, and those who mostly don't. I fit into the latter category insofar as I never leave my reference shifts thinking, "My gosh! Children are so much work!" More often than not, I walk back into the staff offices giggling to myself over the strange, adorable things young children do and say. I have to say, this perspective seems to work really well for me. I'm still loving children's librarianship, after all.