I agree with johnv and TH. I dont think Barona has intrinsic pace of play problems. I played the course as a twosome early in the spring, on a very windy day, and finished 36 in just over 6 hours, on foot. We weren't in a hurry.
I do agree with Craig, though. It seems like you should be able to find your ball at Barona, so people do spend the time to look. And for the most part, I think you can find and play your ball, hopefully without too much delay. I like that about Barona.
However, I was not fond of the patches of thick, tall, irrigated grass on the right side of 17 and 18, just left of the cart path. These lush patches of grass seemed out of character with the rest of the course. (I assume they exist to block the view of the cartpath going over small hills.) Probably just sour grapes on my part, since I managed to hit into each patch, and had trouble getting out.