Yes I have a similar question. I have to decide between JHU and Georgetown and am focusing on the sciences. Besides the new research building that will make interdisiplinary research (esp. biophysics, bio, and physics from what I have read) a lot easier (If you take a look at
http://physics.georgetown.edu/undergrad.htm you will see that Georgetown offers two "kinds" of physics: The popular choice of doing physics for the sake of becoming a structured thinker (later: med or law school or manager) or for the sake of physics itself: The opportunities there are, to my knowledge,
http://physics.georgetown.edu/ (see science for public interest) society oriented in this case, especially at Washington with the government in the neighborhood.
So far about Physics. If anyone knows more about the sciences at Georgetown and postgrad options in the sciences with a GTown degree I would be more than happy to read about that. Right now, the decision between JHU and GTown drives me crazy because I am pretty sure that the environment at GTown is a lot healthier than that at JHU but I am not well informed about any academic sacrifices the decision to go to GTown would cause.
So I hope that I was of a little help and will hear some additional info. As I am a German it is not possible for me to visit the campi.