I would agree with this route. A few times (coming back from the parks when we felt like going to Earl of Sammich) we did go down towards DLH through the entire length of DTD but I always felt it was a longer walk. Even if you were going to take the Monorail when you factor in the potential wait time we never thought of it as a "faster" way to get to the parks from PPH.
Its not a terribly long walk but if time is a premium then the GCH route is IMO the better bet.