Couldn't agree more, and I say exactly the same myself. I am 100% sure that if gamblers had a pile of notes in their room instead of a credit card, and they were able to see that pile get smaller and smaller, it'd soon cause them to understand the dangerous situation a lot better.
Regarding you 'coming clean', made up for you. It's not easy to talk about money, especially to family, so the fact you were able to do so says a lot about your character and how determined you were to beat the addiction.
My brother has never admitted to any of his family that he's an addict, but we know for sure he gambles on a weekly basis at the very minimum, has squandered around 12k inheritance money with nothing whatsoever to show for it, and has gone through about 15 payday loans and now owes about 5k. Our father got us into gambling at the greyhounds from a young age - or at least made us think that putting a few quid on at the tote was completely normal. Infact he'd kindly give us a couple of pounds and send us to the woman at the tote so we could put the bets on ourselves. He'd also, despite having little money himself, find money to put a decent chunk on one of his dogs at the guys standing there with the odds trackside. My brother has followed him into the greyhound 'industry', while me and my other brother have nothing at all to do with it... and lo and behold both my other brother and dad are broke and rely on my mother to basically fund their spending, and me and the other brother are doing absolutely fine.
When I was around 18 I recall getting involved with matched betting and was able to make a grand or two, but there was one time when I had that money sat in my account and just couldn't help myself in putting a few hundred on a dead cert - can't remember which team it was but it must have been something like the equivalent of City to win at home against Norwich, trying to turn that two grand into two and a half or three. Anyway, as luck would have it the team didn't win and all those weeks of work I had put in to make that money were more or less for nothing, and I never put on a bet of more than about £5 since.
Sounds like you could be a good advocate for people who need help getting away from gambling. Well done mate.