I agree with the noise of the process. Actually, the whole experience was a good one for me, maybe I didn't express it in the post? Anyway, I got a job in Amazon UK at the end, so not too bad.
I truly enjoyed them bringing me out for the weekend before my interview so that I wasn't rushed and to give me an opportunity to see the area. I also enjoyed the interview process itself (well, right up until the point one of my interviewers introduced me to some math I had no chance of solving). One of my interviewers even stayed in touch with me after the process, checking in occasionally and helping me make some new contacts.
Today, when I interview people, I keep my Google experience in mind and try to provide candidates a similar impression of my firm.