Just wondering if anyone has any opinions or thoughts about golfing at different elevations.  For example, have you experienced noticable differences in your shot distances, or is the effect largely superficial. 

I live in Calgary, AB, Canada, in the foothills of the Rockies, at an elevation of ~3700ft above sea level.  There are many mountain courses I play that are at elevations above 5000ft.  Most of my golf has been played in western Canada, probably above 2000ft, with very few rounds close to sea level, so I don't have much of a basis for comparison.

I was once told (apparently second-hand from a PGA tour player) that the reason the tour doesn't play in mountain regions, is that most of the courses could not be lengthened enough to significantly challenge most PGA players. 

Maybe someone from Titleist could validate this from a scientific/ball-flight aerodynamics perspective.

Cheers.