There seems to be a lot of confusion over what 'crate training' actually is. I always use a puppy pen, which is not a small crate, but mesh panels measuring about six feet by four feet, open topped. I put newspaper at one end and a bed at the other. There are toys, bones and chews available at all times. The pup(s) are able to move about and play, eat, sleep and wee in their pen on the paper if they need to. They are let out regularly to play and socialise, but they then go back in their pen so they are safe and secure. They are let out in the garden often and always after feeding, playing and waking up, but have no fear of weeing on their paper if they need to although this happens less and less as the time goes on and they can physically hold it for longer.
I use smaller crates for transporting in the car, and all my dogs travel in them either singly or in twos or threes (been to Paignton this weekend and we had nine dogs in the vehicle and three people). All were in cages for the journey and slept in them overnight, but were all given lots of exercise at the show and where we stayed. There is no way we could have managed to take all those dogs if they were lose in the car and could not have taken them in to where we were staying. Alto at the show they have their cages on their benches so they are safe and have somewhere to switch off and rest between classes.
I cannot contemplate life without dog cages, and my dogs love them, they are their own den, which they happily go into if the doors are left open.