Ha, I've been having that summer camp discussion with various people over the past week (due to having been at a wedding with genarti that took place at a summer camp.) On the East Coast, at least, they're still very much a thing! Day camps and away camps both; I only went to a cabin-in-the-mountains kind of camp for a few years, and only for one-month stints at a time, but a lot of my friends were HUGE camp people and would spend their whole school year looking forward to their two months away at camp. It kind of surprised me to find out that away from the East Coast people don't consider that a usual thing.