+/-50 ydss center of green to center of tee is pretty standard. Each case is particular and the specifics have to be taken into account and adjusted accodingly.
I'm sure the graphics had something to do with it. While I diidn't have a problem understanding what Garland was proposing, I was thrown by scale on others. Not having the ability to scale out distances,, we had to trust the Ol' eyeball method.
Nick, of course one would rather not have long, uphill treks while you can get away with longer downhill ones. Afterall, we're playing golf, not hiking. Keep in mind that the average golfer get uncomfortable/distracted hitting an approach when golfers are teeing it up within striking distance.
We try to provide enough separation between hole centerlines (70 yds min) on adjacent holes and a min. of 30 degrees off the tee. As it is common to fan the up tees towards the outside of the dogleg, this pulls those tee further away from the adjacent hole.
Safety should be your main parameter and getting that to conform to the best spots for greens and tees is somewhat of a puzzel to solve with tradeoffs and compromise. Many times it's what separates the good from the grreat - knowing what you can get away with and what you can't (or shouldn't).