I've had a S3, then a S6, now a S9. All the aluminum / Ion-X varieties. All have been banged around here and there, but never suffered anything beyond one or two very superficial scratches. I wear them working on the car, in the yard, exercising, hiking... only time it comes off is to charge or sleep. I just submitted my S6 to Apple as a trade-in, actually, and despite wearing it for 3 years, I could only find one tiny nick on the side of the case.
I don't baby anything, but I'm also not prone to being a klutz. I've never broken the front or back glass on a phone, for example.
In the end, the Apple Watch is a nifty wrist-worn computer with a limited lifespan. I'm not going to fuss over it like some prized heirloom mechanical watch, that's just silly (IMO).