The Mountain View Public Library is a really fantastic public library. A little while ago, they redid the check out system and switched to using RFID for everything. I can walk in check out books and walk out again without having to interact with anyone.
I put a hold request for a book recently via the library's website, and it came in a few days ago, and just popped down to pick it up. All of the books on hold for people are on a set of shelves in the "holds" section, with a bit of paper sticking out of them with your name on it.
I was ferreting around these shelves, trying to find the P's, when I overheard a woman remarking semi-shocked to her husband about the privacy implications. She commented to a librarian stocking shelves nearby about how she worked in library in Fort Lauderdale, and weren't they concerned about privacy and everyone seeing what these people were reading? The librarian said that she guessed not.
I must have low privacy standards (or I guess everyone else who puts holds on books in the library does as well) because I really can't see a problem with the way the holds are done.
It would be horribly inefficient to have to ask at the counter for my book (the holds section would have had easily a hundred books on the shelves). The bit of paper has my name on it. Granted, it has a fraction of my middle name, so it's a little more personally identifying than it perhaps needs to be, but either way, I don't consider it a terrible invasion of my privacy.
As it was, I was able to walk in, find my book, use a self-checkout machine and walk out again. For that convenience, I'm prepared to lose a little bit of privacy if someone wants to spend all day, every day, casing the holds section of the library just to try and figure out that I'm reading Good calories, bad calories