Mark,
Of course they encourage walking and of course they have superior caddies, but there are plenty of players that take carts. I have no earthly idea what the percentage is, but I'm thinking it's well north of 50%. At the risk of repeating a story I've told here before, let me just say that I went out as a single one day. I whacked the starter a hundo and he graciously got me out with some guys. There were two Japanese tourist types who didn't speak English, but who knew how to take a photo or two. If they had a handicap it would have been 30 or so. Then the other guy was from the Midwest. I wanted to walk, but wanted to be social, so I asked him what he was going to do and he said he was gonna "drive". I said, "Okay, I'll saddle up with you." "No, my wife is going to ride with me," he said. "No shit, they're letting us go out as a five some?" "No, she's just gonna watch."
I should've walked away right then and there, because I had a bad feeling. This guy's name was R.J. and his pain-in-the-ass wife sat in the cart all day, barking instructions at him about his atrocious golf game. "Keep your head down, R.J." "Stop slicing, R.J." Et fricking cetera. And of course they posed for a photo on every coastline hole. By the time we hit the back nine, I was working on rudimentary Japanese, as a method of social survival. I've only gone back once, for a tournament in which we played three courses over three days and then we got on Cypress. I'm unlikely to go back, unless it's for that same December tournament, which is fun. Mostly because the R.J.'s of the world are not allowed.