Fuwing2007, No I am a prospective grad student like yourself. Although I will most likely be attending UPenn for grad school
.
Yes, I also had my heart set on many places like Berkeley, Chicago, et al, and have been similarly disappointed. Take as comfort that there are tons of overqualified applicants for very few spots at each of these schools, but at the end of the day all you need is one "yes." Choice is nice, but very few elite applicants have their pick of the cream of the crop.
The 52 admits for Columbia (I am also waiting to hear back), could be misleading. Although there is some independence in the admissions process, very many of the same people who are accepted at Berkeley, Chicago, MIT, and so on are admitted (and apply!) to Columbia. Accordingly, grad chairs there know that they need to admit 50 in order to get a class of 10. For Harvard and Princeton, their yield is so much higher that they know that they need only admit 15-20 to get a class of 10-15.
Also, if you don't get into the grad school of your dreams it is possible to take a year off and apply again. I've had advisors also tell me that if you get into at least one "serious" or "good" PhD program you should go and you can always transfer if the research really isn't ideally suited to your interests. Best of luck!