It used to make all the difference for me; I was a hothead and would get in a bad mood and not come out of it when I was off my game. More recently, I have seen the light (thanks in part to my discovery of this site
) and I have gotten much better about not focusing so much on the score when I'm playing poorly, but just enjoying the course and trying shots. That is much easier to do on a good design.
Of course, all else equal, I would rather play well, who wouldn't? Still, I've found that when I can take things a little easier and step back a little bit, it makes the inevitable bad rounds far more bearable.
What difference does GCA make?
I recently played a course in NC that, IMHO, was a horrible design. Forced carries every other hole, narrow fairways, OB and lateral hazard everywhere. I didn't bring my A game, it was awful. Even with my new enlightened attitude
I didn't enjoy it at all; searching and dropping every hole can have that affect. I honestly believe that on a well-designed course, eg. CPC, Pinehurst 2, TOC, you can play poorly and still enjoy it because 1. there is something to accomplish on every shot, and 2. the smart golfer should always be able to keep his ball in play. Even at 16 at Cypress, Mackenzie gave the lesser player or the one having a bad day the opportunity to play it safe.
So, I hope that's not too rambling. Basically, yes, playing well influences me, but, so does the architecture which can have a counteractive effect.