Pat,
I don't know for sure about Gil, but I suspect each of us architects has a different tolerance or experience for lawsuits! If there is ever a near miss, or golfer hit there, I wonder if Gil's next project would have tees spaced out further....
That said, in recent years, if a tee is directly behind a green, I have started to place them closer, and closer to the previous greens, especially if its only a back tee, which might see 50 players a year. The chances of someone being hit in those conditions is very minimal. I do not place tees any closer if directly right or left of the previous greens, though.
BTW, while not directly related to lawsuits (but kinda) there have been some published studies and writings showing the percentage of stray balls off the next tee. Most show that the preponderance stays within 15 degrees of intended flight, and all but the really wild shot stays within 22.5 degrees. Add in various tee locations, etc. and keeping the green, and its attendent cart path out of the shot pattern of the next (or other adjacent hole) moves them further apart.
That is just something gca's learned via experience (and lawsuit) that perhaps the old guys just didn't know. Or, as play increased, it just became more apparent. Society has less tolerance for injuries in the post industrial era, especially non essential injuries as most of us would consider golf injuries to be (maybe not Melvyn, who may think holes too widely spaced reduces the appeal of golf!) non essential. For that matter, larger tees and greens to spread out wear tend to push holes further apart, too.
So, for all those factors, golf hole spacing has increased over the years.
Mac,
You should credit Brad Klein wth the routing is destiny comment. He is right, though.
And, as I suspected, ease of routing has more to do with fitting the land than being close together in the GolfWeek ratings.