20 year industry vet here. When I started, it was in a company that was hiring nothing but people that have never worked in games before (and they did not tell us this, like some bad reality show). Of the ~200+ people I worked with there when I started, I would very generously estimate maybe only 10-15 of us still in the industry. To be fair, conditions in the industry have gotten a lot better since most of those people left it. The days of doing 80+ hours a week are long gone for most of us as far as I can tell.
It's really all about loving who you are working with. Even if you hate the project or the hours, just enjoying being around the right people makes a huge difference. Writing that is making me realize just how many of my favorite people and closest friends are now elsewhere and damn, I miss them.