Yes, that is very different from what I experienced at Berkeley as well. There were some notable differences between my PhD application and undergrad, in that PhD admissions committees weren't really interested in the undergraduate dog and pony show of "tell me how your volunteer work and experience playing the flute in your high school orchestra shaped you as a person..." My personal statement was about what I intended to get out of a PhD program and a vague direction of possible future research interest. Interestingly, med and law school applications in the US are much more similar to the undergrad essay than PhD programs.

But still, even the PhD statement was nothing like the 5-6 page proposal with a clear research focus that you described. Sounds more like the kind of program I'd be interested in if I were to go back, as I'd be mainly interested in researching something deeply, not taking classes.

Well, good luck, hope it works out for you.