I've never had a crate before and with this one the plan was crate him until he was housetrained and finished teething and then he could have free reign. It also kept the cats from attacking him while he was still little and they weren't used to him.
However, he's 19 months old and still chews everything, I mean everything - I'm so glad he's crated because I'm pretty sure he'd manage to kill himself without it.
It's huge, it's hideously ugly, it means I don't really like leaving him for any length of time, but he wants to chew wires, coins, he has a special fondness for kirby grips and pens, he's also big enough to reach any surface and can shove furniture out of his way...he'd just not be safe without it.
It was also handy when he had to have an operation and he was already crate trained, much less stressful than having to suddenly confine him.
He's very fond of it, but I'm sure he'd feel the same about any bed.
But, that doesn't mean every dog or owner needs one - if you don't see the need for one, you don't have to get one.