The plan with my current dog was that he'd be crated as a puppy until he'd finished teething and then I'd get rid of it as it's huge and takes up loads of room...
However, he's a chewer, he would if left to his own devices shove furniture out of the way to chew electrical cables, he has a fetish for small metal objects including pulling screws out of walls to get them. It just isn't possible to dog proof a room short of building him one out of cement...and even then I'd worry he'd damage himself with that.
He's also had two operations requiring vet stays and cage rest - I'd hate to think how stressful it would have been to introduce him to a crate while ill or recovering from an operation, for that reason I'd recommend everyone makes sure their dog is comfortable with a crate even if it's not in regular use.
His illnesses have left him with issues and he has to be kept away from strangers as he's unpredictable, because his crate is somewhere he's happy to be, that's easier as well.
Mostly though, he just likes it. It's where he chooses to sleep, even when we're here, it's where he runs to with his stolen hauls (socks, batteries, whatever he's decided is the object of the day) and if you take the actual bed out to clean or do anything he lies miserably on the metal floor rather than on the spare cushion on the other side of the room.
Yes they can be misused, but so can anything - as long as they're being used to keep a dog/puppy safe and secure when you can't supervise them and not for long periods of time, they're great.