Greywalls is another good example of a tough par five as an opener. You've got a wide open tee shot, and have a few easy options about where to position your second, but sooner or later you've got to take a shot at that tiny plateau green.
The second there is no picnic, either, navigating a tough, rumpled fairway and then committing to and executing a solid route onto the green. Big numbers are not rare on the first two there.
Regarding Crystal Downs, that tough start continues through the first four holes in my opinion, particularly when you're battling the prevailing SW winds. But then again there is not much let-up there the whole way around.