I can't stress enough how important it is to play all of the courses. A little background: When I first started, I played just BPB for a few days. After that I played just Kiawah for a week or so. I felt like I could handle my clubs, so I moved on to St A's to learn to play moderate wind for a week. After that, I felt comfortable playing any of those three. When Congress and RSG opened, I played them both, but Congress frustrated me badly at my tier with my clubs from the championship tees. RSG I made a real run at, and am now comfortable playing there. After that, I went back to Congress with longer clubs and learned that course.
Notice something missing? Two things, actually. The first is Oakmont. I had tried there a few times, but I think my best 18 there was a -3 67, my best 9 there was a 33, and most times my scores ranged from par to disaster. So, I just didn't play it. I avoided RGs there, general tourneys there, CC tourneys there. It is self-fulfilling. The greens terrified me, so I avoided the place, thus never learning to putt there, so when I did play there, I was horrible. I had shot a 60 or lower at every other course(actually, just broke 60 or lower at Kiawah this week, and my best at Congress is a 61, but I have shot 28s on both sides, but you get the point), but I could barely break par at Oakmont. Finally, two weeks ago I made a CC tourney there and played it... a lot. I topped out at a 62, but now I feel comfortable there (as much as one can be putting on glass). I managed to break 30 on both sides over the course of trying to catch the 59 that won the tourney.
The other missing thing is heavy wind, something I am trying to tackle now, in preparation for next summer's tourneys. I hate, hate, hate, hate high winds at St. A and RSG, and I know next summer The Open will have high winds like that. I want to learn to play them now, so I am comfortable then. And the US Open will probably be similar, though maybe a little milder. So I'm going to bite the bullet now and start playing the Unlimiteds in high winds to get comfortable with them.
The lesson: Well rounded wins every time. Well, maybe not every time. I do know some who could kick my butt on certain courses, but I'd win the majority on other courses. That's just fine with me.