I have a Great Dane and a St. Bernard, and they were both crate trained as puppies.
They LOVE their crates.
When they reached adulthood we started leaving their crate doors open at night, and now we never close the doors ever (even when we're gone during the day).... but the dogs still love to sleep in their crates. Our Great Dane especially uses it as her own special place when the house is too loud, or when she's sick of the TV in the living room being on, or when she gets ticked at us for yelling at her for something and wants to go pout
The St. Bernard will typically sleep half the time in her crate, some nights in the bathroom (likes the cool floor with her thick coat), and then the other nights by my side on the floor by the bed (especially when I'm sick).
I should add, they have pretty cushy beds in their crates. We just can't allow two 125 lb dogs on our furniture. The house would wreak to high heaven, would never be able to get everything clean, and I'm not sure my husband and I would fit anymore
haha
But we even tried just having their beds in the same spot without the crates (because the crates are HUGE)... and no dice. They didn't sleep that night, and kept trying to wake us up. Then the Great Dane tore her bed to shreds. So, we bought a new bed, and when we put it in her crate she was so afraid we might take it away again, that she immediately went in, curled up, and REFUSED to come out for several days (except to go outside, and then she went straight back in).
Point taken, puppy
This is how she spends most of her days now: In all of her vicious laziness.