Not a Berkeley alum, but I went to UVa; which is considered a similar tier (if I remember right, the top 3 public schools in the US, at least by News+World rankings, are usually a toss up between Berkeley, UVa, and UCLA).
I think this is definitely true, and in basically every field a top school is strong in. The upper level courses, even at the undergraduate level (especially the ones people are not required to take. If it's a required course, /someone/ has to teach it, and they might not be that into it, particularly if they aren't teaching faculty. If it's an elective, they're teaching it because they think the subject is awesome.) are usually being taught by people who have made it their entire life's work to study that field, and at that level of University are often some of the best people in that field. That kind of perspective, depth of knowledge, and passion don't necessarily translate well to teaching (I can think of some math professors that I had...), but it often does, and even if it doesn't those professors are usually /amazing/ resources outside of class if you want to know more about (subject of choice), what the current problems in that field are, what's considered important or valuable, etc.
I'd hesitate to make sweeping generalizations, but I think that if you didn't manage to take as many advanced courses (particularly graduate ones. Good undergrads at institutions like that can almost always handle the graduate courses they offer after they have the sufficient background) with as many top people in a field (or fields) as possible, you wasted an opportunity if you were at a school like that.
(Full disclosure: I come from a family of liberal arts professors at UVa, whose social circle largely consisted of other liberal arts professors at UVa. I might be a little biased on the matter... but those people /know their field incredibly well/. All of the ones I've met, both outside and in school, are both very, very smart and many of them spend the majority of their time thinking about one field or area of study.)