I've had mine disabled for well over a year. It's GLORIOUS. People send me private messages asking me questions that I surely would not have wanted plastered all over my wall.
They are all: "howcome I can't write on your wall??"
and I am all: "exactly."
anyway - this especially comes into play when you're due to have a baby tomorrow & no one can leave those annoying "have you had that baby yet?" comments. Love it.
Re: why disabling your FB wall rules.