I ****ing hate that statement with a passion, it just reinforces employers taking the **** and employees willing to accept it. Employment isn't one sided, it's a two way street, you want their money just as much as they want your time and expertise, and so things should flow freely between the two parties, not one side taking liberties because they can. You'll never here me mutter the phrase "I'm thankful just to have a job".
but you'd be pretty dumb to take one in that industry and expect to work 35 hour weeks - or at least, if that's what you want, then find a suitable employer to cater for it