They do, and I can't remember when I last called a woman 'Mrs' or 'Ms'
I work with quite a few women, and call them Jane Smith, or whatever their name is. In the same way people refer to me as Peter Thomas - nobody ever addresses me as Mr. Thomas, even on the rare occasions they send me letters.
A married woman doesn't have to be referred to as 'Mrs' unless she wants it that way - there's no law that says otherwise. A woman may refer to herself as Mrs., Ms, or Miss - it's up to her to decide. Likewise, married women are under no legal obligation to use their husband's surname.