Kenmore's public library has a low density of books as well - wide aisles, low shelves. I suspect it is partly due to wanting to be accessible to people in wheelchairs. But few books kinda defeats the purpose of having a library.

Half-Price Books in Bellevue is more my speed. It's completely packed with books. I could putter away hours in there.

Damn, how do they keep the books from falling out of those sideways shelving units in Seattle? ;-)