call me foolish, but i would assume any professionally designed course would have fairly accurate Tee distances. Any course with any sort of competitiveness and with a large community, should have fairly accurate tee distances also.
(Wondering out loud) A lot of you might not be factoring the "true" distance based on elevation changes or how far you want/need to throw. 300' uphill might realistically be a 400' throw, and a 400' downhill throw may be a 300' throw (in DG terms).
I am very conscious about my throwing distances (with all discs), enough so that i frequently throw in a field to verify current throwing distances. when i am on the course i am very keen to gauge my drive against the pin distance, etc. (almost every course i play has marked distances)
I'm also one to ask others about distances when i take a 2nd (or 3rd shot). "The hole is about 75 feet past that hill crest, 15 below it, and just a touch left of that tree....right?" As a result, by estimating the distances, i can make my disc selection based on consistent throwing results.
i only care about the pin position and distance IF i think i can throw that far. Otherwise, my only distance concern is how far the distance is to where i want to put the disc.