For me this is a subject that's worthy of its own book.
I've said on other threads that I do not enjoy "relentless" architecture. It's not just that I'm a 10 handicap and I recognize that most people don't enjoy walking up the 18th hole punch-drunk and bloody -- it's that the thing I value most in a golf course is a VARIETY of holes, and if every single hole is "a hard par but an easy bogey", there is not much variety there.
Life is not a series of "tough but fair" challenges, and neither should a golf course be. There should be some holes where par is a great score -- two-shotters where the stroke average for low-handicappers is more like 4.5 -- and there should also be some holes where a birdie or even an eagle are on offer to the 10-handicapper who hits a couple of excellent shots. Par fours should have stroke averages from 3.5 right up to 4.5 and everything in between, based not just on their yardage but on differing levels of challenge from tee to green.
Really taking this philosophy to heart is what allows us to build a golf course that fits the land, instead of trying too hard to modify the land to include certain types of holes.
We don't design in a vacuum, we design on pieces of ground. A couple of people have asked recently if I deliberately chose to build most of the par-5 holes at Pacific Dunes on the long, flattish plain where holes 3, 12 and 15 are located ... but the truth is just that it was a plain that had to be crossed three times, and that was how far across it was, so we tried to make three differing holes of similar length in that space. If it had been 400 yards across, we'd just have made three differing par-4's, and tried to find our par-5's somewhere else.
Likewise, where there is occasionally a fairly featureless stretch of ground which has to be crossed in the routing, I may well build a hole which some call a "breather". I love the fact that good players EXPECT to make birdies on these holes, and because they do so less than 50% of the time, they can be affected psychologically just by making a par -- and particularly if their opponent makes a birdie. So I may throw in a "weak" hole now and then when the land tells me to ... but it's not because I am deliberately trying to put a "breather" at a certain point in the round.