$.get(), $.post(), $.getJSON()etc.) and it would be a shame if you would have to duplicate adding CSRF tokens to all your ajax calls manually or by going back to
$.ajax(), because the convenience method didn't support the way you wanted to add the token. But jQuery, being the customizable framework it is, of course allows you to add these kinds of things through events.
In an IdP/SP (Identity Provider/Service Provider) Single Sign-On scenario, you might also want to have Single Sign-Out, meaning you can log out of all SPs with a single click.