Like others have said, if your boss is calling you at 7PM to do a worksheet for a meeting the next day, one he has likely know about for a while, then worrying about your work/life balance is the least of your problems.

As it's not so much the occasional 'Crap, we need X stat!' that is a problem, it's the constant assumption that your boss can call on you any time and _expect_ you will comply.

That's just a shitty boss. Regardless of their title.