This is already present in Mavericks under Contextual Menus which uses Apple Maps in 10.9. Just select an address, right click, and chose the 1st line. It also lets you add the address and map or update an existing contact with the selected address.
However if you must have it in Google Maps and the small Google map that Contextual Menus under the Services/Search with Google heading is not good enough for you, then you might consider paying $2 for this App in order to avoid an extra click.