I pick 2 points on the runway..I aim at the top point i.e. if I don't do anything the plane will hit this point very hard..when the second point disappears under the cowling I smoothly go to idle and bring the plane to a "S&L" nose attitude..
For me the length of a runway line seems to work just fine..on grass strips and unmarked I pick spots.. Certainly helps with night landings and certainly overcomes the visual illusions of different runway configs..
my 2c worth