I was an exempt employee most of my life and never worried about working extra hours because my employers gave me comp time which came in handy when I needed to handle personal errands on business days.
Same here... I can't imagine the complications a law like this would make.
I often worked weekends, holidays, and made several trips to Argentina, Mexico City, London, etc... sometimes make a trip to do one day's work there. Do you have to get overtime for sitting on planes for 20 hours for a trip?