While the quotes are nice, at the same time ignoring curse words entirely is basically cutting off a significant portion of expression. While I'm not saying you should litter all of your sentences with them, they do get the point across much better than not.
In my opinion swearing is less an indication of stupidity and more an indication of being cliche. You can swear all you want but you won't say anything inventive. Take for example the best f-bomb ever: YIPPIE KI-YI-YA MOTHER FUCKER. I'm pretty sure that only meant `fuck you` with some country-style rebelliousness thrown in. Awesome yes, deep it was not.
Cursing is like salt: judicious use can improve a well-made dish, but overuse doesn't make bad food into good.