I don't have to put mine in, they are trained to walk in when asked, or go in on their own accord;
For a young pup, they are one of the easiest and most consistent methods for housebreaking. It's a safe place for the dog when household activities demand that a dog not be underfoot. If your dog ever needs to stay overnight at the vet they will most definitely be confined, being accustomed to this reduces what is more than likely already a stressful situation.
Having a run of part of the house is fine when they are older, and you have a better idea of what to expect. I do that with my three, but as pups they still have to be watched;
My dogs are often found napping in their crates, which are in the kitchen. The doors are always open unless there is a reason for them to be confined. Often Gus & Izzy will squeeze into the same crate to nap together. Kaz likes his space.
Izzy is a rescue, and has some issues with thunderstorms, I set up a "bomb shelter" of sorts downstairs under the computer desk. It's a styro on its side with a dog bed, similar to a crate and a little bit soundproof. Her & Gus are in there ATM, by my feet, same routine every night. Crating works off of a dog's natural instinct to find a smaller enclosed area for shelter and to sleep, it's easier to work with nature than against it.
Recently there was an article in the local newspaper about the dangers of driving with a dog, or any pet for that matter, unconfined in a car. Besides the obvious distraction to the driver, your pet can become a projectile in the car, risking serious injury or death in a very minor accident. A sturdy crate belted in greatly reduces the risk of either of these situations.