Ya, it's somewhat surprising that ZZ isn't the binding that is burned into people's minds instead of :wq<cr>. I've even met regular vim users who don't know ZZ which, to be a bit hyperbolic, is mindboggling.
EDIT: And of course there is vim -y to make vim behave more like a "normal" editor than even nano :D (ie, you get ctrl-s and ctrl-q).