I agree with you Anders; that is what I basically do. However, when talking to a stranger, I can hardly refer to my wife as 'Marie' without explaining the 'connection' - same goes with kids.
In my own eyes, true chivarly died with the introduction of 'Ms' ; just as when I sometimes find very 'women's lib' aware women who look at me as a geek if I open a door for them, as I do for men as well anyway.
Life was so 'elegant' before bras were burned; mind you, I cannot abide sexual discrimination; I just enjoy being a 'gentleman' to 'ladies'.
'Chivalry' was the reason many women were kept bound by men before the women's liberation. Anyway, I think it is fair for women to have the ability to choose a title that does not give away marital status when men have one by default.