I have raised dogs for years. Some were crate trained, and others not. The ones that were crate trained simply destroyed less of the house and learned to go potty outside in half the time. I don't believe that you should crate your animals during the day while you are at work, and then again at night. The crate needs to be treated like a bed... for bedtime and SHORT occasional naps only. If you are unable to spend the other time with the dog, or give it a place outside to keep occupied I wouldn't reccommend getting one until you can. If you keep them in there for long periods of time they will develop all kinds of personality disorders and maybe even anger issues. My dogs love their crates. After all, dogs are den creatures by nature.
Imagine letting your children run wild in the house at night or while you were away before they were potty trained

It could be dangerous for them as well as messy for you!