Its a fairly crazy start to a round on hole 1. You are definitely winded by the time u get to hole 2, which of course continues to wind up the mountain. LOL.
Another thought might just be that most players are not up in this kind of course every single day. You may be able to attribute the high scoring of the course to ppl actually enjoying the change from a park or open space style flat course.
Most ppl I know that have played it really dig it for the terrain change and the fact that they are genuinely beat and tired by the time they finish. Beyond that, the challenge of really tight tree gaps adds to the thrill of playing it. This can also cause a spike in ppls scoring (especially if they make it through the gaps for a good approach shot or putt).
Here's a fine example of the nice gaps you are shooting through:
No worries on knockin it (you stated ur not much for mountain courses anyway), but you're more than welcome to dropping a msg to any of us in Denver when you find the time to take a road trip. We will gladly throw a round with you in the Rockies.