15 at RSG is dead straight. The flag is typically a good line from the tee. 18 is also pretty much dead straight. Down the road from there is RCP - 1 is straight, 3 is straight, 12 is straight - all really good holes.
At Shinnecock, 10, 12 and 16 all look pretty much dead straight. 16 is an interesting one because the fairway snakes all over the place, but if you play it in the natural three shots, then each one you would be aiming at the green.
5, 8 and 9 are also all dead straight at NGLA. I feel like there's lots of really good straight holes. Though I must admit some that I thought were straight aren't quite. 15 at PV is the one that I thought was a good example of a super long hole that's straight, but it turns slightly right at the end.