The Associated Press Profanity Study (PDF) asked questions such as how often do you encounter people using profanity (3/4 said frequently/occasionally) and how much does it bother you when people use profanity or swear words (2/3 said a lot/some). I'd be interested to see the raw data, to see how the percentages correlate with the demographic data they asked (i.e. is there a correlation between age and profanity? education? political party?)
I'm pretty strongly anti-profanity - I try not to use it, and generally find the use of profanity offensive. I find it very ineloquent when people resort to using the f-bomb every other word, using it as noun, verb, and adjective because it's convenient. My sentiments parallel those of Montana NPR, which has a spot they run (or they used to) about how they believe in precise language. Words can be very powerful - clearly expressing oneself is something I respect.
This is probably one reason so many people dislike email. They complain that they're losing the nuances of conversation, or even a phone call, but much of that could be alleviated by people improving their communication skills (not that I receive that many profanity laced emails).
Of course, I'm definitely in the minority here - when I told my students that I abhorred the use of profanity and wouldn't tolerate it in my class, they thought I was a freak. Not surprising, considering that most of them wouldn't go less than five minutes w/o using profanity.
I even had someone go off on me at No Sweat when we were talking about this, saying that my view point was stupid (with gratuitous use of profanity no less).
The other big reason I dislike the common use of profanity is that these words lose value - much like the boy who cried wolf, if you constantly use the f-bomb, eventually you have no where left to go when you want to express something stronger.