I met my wife at work. Second time around for both of us. We worked in different departments so there was never any conflict, either real or perceived. After we married, she eventually left the company for a better opportunity but we never had any problems professionally while we were both there. Never had any problems personally either.
We've been married 18 years now and we grow ever closer as time goes on. We worked for a major Fortune 100 company, and there were several married couples at the plant.
My dad met my mom at the company they both worked for. Likewise my uncle and his wife. They all went the distance. Not all work relationships end up being horror stories. It depends on the maturity and emotional stability of those involved.