What percent of the general public is aware that walking through their neighbors front yard is a crime.
Where did you get that it is a crime to walk through your neighbor's property. I don't recall anyone saying that. It is not a crime (in most states) unless you are given notice not to trespass, either by sign or verbal notice.
In my state (NH) you can trespass on another's property, and the owner cannot be held liable, for purposes of sport (hunting, etc.) unless the property is posted. The law on criminal trespass says;
I. A person is guilty of criminal trespass if, knowing that he is not licensed or privileged to do so, he enters or remains in any place.
II. Criminal trespass is a misdemeanor if the person knowingly enters or remains.
(1) In any secured premises;
IV. As used in this section, "secured premises" means any place which is posted in a manner prescribed by law or in a manner reasonably likely to come to the attention of intruders, or which is fenced or otherwise enclosed in a manner designed to exclude intruders.
So it depends on what "privilage" is, and as i previously said, and the caselaw stated, privilage is implied unless it is specifically denied by posting or direct notification.