When they brought me on-site after that, I interviewed face to face with 5 or 6 people in a row (except for a lunch break), and every one of them asked me a two or three questions and then switched to tricky whiteboard problems.

I remember one was 'write a function that draws a 2D skyline from a bunch of 3D buildings', which I got totally stuck on because there's so many possible configurations of heights and widths and how they overlap that complicates it, so I didn't really know how to properly solve it.

I didn't get the job. I thought the experience was interesting at the time, and basically treated it as a free tour of Google and a chance to eat In and Out burger again, but I don't want to go through that grueling exercise again (or spend a ridiculous amount of time prepping for it... as it was I spent a solid two weeks studying for it the first time around), so I've said no to Google recruiters every time they've gotten in touch with me since.

I might have given it one more shot, though, if I were willing to move to Silicon Valley at this point in my life, but I just bought a pretty decent house and I'm not really wanting to give that up to take out a mortgage five times what I have here just to live in a smaller house in the Valley and be able to say I worked at Google.