William, which Bandon Trails are you talking about? I wouldn't call #1 flat, #3 rises up about as much as #13 at CB, #4 is uphill, at #5 you gotta walk down and then up significantly again. #6 through #9 is all uphill before turning back. And that is all before the trek at the end.
Compare that to CB where #1, #2, #3, #6, #10, #11, #16, #17, and #18 are all pretty flat.
You go hole by hole and you walk up and down far more at BT than at CB.
And this just proves that people knock down CB far more than other courses. Old Mac goes up and down as much as CB and you never hear people complaining...