I consider use of profanity not to be an indicator of any of the following:
Laziness
Lack of intelligence
Lack of articulation
Lack of class.
Because you can go out of your way to swear. You can swear and make a fool of yourself. And you can swear in sublimely perfect diction. In fact, some of the best writing and insults I've ever witnessed are exactly the latter. Call it the Stephen Fry syndrome.
The indicator is: Is is JUST swearing and no content? Have I used expletives to bulk up an sentence otherwise devoid of meaning or insight? Or have I used them as a superlative that's informal, on an wildly informal forum, for exaggerated or comic effect?
People who don't swear scare the shit out of me. Honestly. I've met a handful in my life and even the most prim and proper of ladies working in the most exclusive of establishments will resort to a curse in the right circumstances or if they feel the company is suitably informal and won't be offended.
Those that don't swear use it as a personal crusade against the others, but it's such an easy target (precisely because everyone does it) that it means nothing and is usually a form of oneupmanship. "Look at me, I don't swear, aren't I perfect?" While I guarantee you that the upper-classes swear like troopers (most of them have served in the military and therefore are probably among the worst!). Prince Philip has a reputation for it, for fuck's sake.
For reference, I work in an exclusive private school during the day. I am in an environment where it's impossible to swear because of the age of the children (hell, I get told off if I call them "students" rather than "pupils"!) and the prestige of the school. I guarantee you, to a man, every member of staff right up to the very top will eff and blind in the staffroom. No matter their background, no matter their upbringing and no matter their outward appearance. All are highly educated. Most are privately-educated themselves. Hell, the groundsman is a former pupil from 50 years ago that has a diction I can only emulate in jest. And you've never heard swearing such as that present in the staffroom, I assure you, and not aimed at anything (or anyone) in particular but used as superlative.
Swearing is not some class-bound element of society, nor tied to the lack of an appropriate vocabulary except in the most extreme examples. It's a superlative, usually with plosive sounds which actually "feel" better than any more moderate alternative.
"Gosh darn it" strips the sentence of every harsh syllable.
"God damn it!" doesn't.
The harsher the plosives and "k" sounds, the worst the swearword, for a reason - it "sounds" better. Did you know that swearing while holding your hand in freezing ice-cold water (or any pain experiment) actually increases your pain response? Mock-swearing doesn't. Your brain is able to tell the difference and is MORE satisfied and distracted if you're allowed to swear properly. It's a confirmed, physical, biological, neurological effect. Google Stephen Fry again if you need to witness it, along with Brian Blessed.
Similarly, almost all swearing is tension relief coupled with plosives for superlative effect, and in some cultures (I'm British) is seen as a natural part of expression and even bonding. If I don't swear in front of you eventually, I'm being incredibly formal or harsh - and therefore impersonal. I'd be hard pressed to feel comfortable in an adult's presence that I couldn't swear in front of. Sure, we all do the gentle introduction rather than going straight for the c-word in front of a stranger but it's honestly nothing of import.
So, to summarise, you're fucking wrong.