You say you need time to think? Well, it seems that Brown is the audience favorite, so why not look into deferring for a year in order to travel and rest up a bit? I did not apply to the same program, bu the one I did apply to at Brown let me defer for a year, and I've been having a blast. If you're feeling the burn-out and need some space, this might be a good compromise. Just a thought.
Good luck either way!
Neurone- The reviewers leave relatively detailed comments. They have a box for the impact and merit and comment on each of those (if I remember correctly). I'm not sure how the system works, and if everyone gets comments, but I would hope that was the case... that way it can be a learning process. As for the chances of getting the same reviewer twice, I am afraid I don't know.
Good luck all!