There are rules in golf for good reasons. When you are playing slow, and not letting other groups through, you are being discourteous. Other things happen when newbies play, too, like scuff marks on greens from players who don't know how to pick their feet up, uncorrected ball marks on greens, divots not replaced, etc.
Of course munis are the worst for this - last week we saw a foursome of kids (couldn't have been any older than 20) who were riding on the back of the cart, no shirt on, boom box blaring, beer cans flying out into the rough. Kind of takes all the fun out of it.
EDIT: And yeah, there are times when golf DOES suck. Like when you go out and shoot 94.