[caminante]

I had the same revelation in an actually quiet library v. libraries co-opted by study groups.

The first time I studied in a quiet library, I was blown away by my ability to sustain a flow state. The atmosphere, the minimalism and reduced distractions helped tremendously. That said, I had to keep my guard up and avoid falling into a routine of "going to the library" with the expectation of GTD automagically. To that end, I would consciously sit in different places (to mix things up) and make sure I had a To Do list which I worked through.

Edit: Another key revelation is the expectation that if someone needs to make/take a call, it was expected for that person to step OUT of the room. Remarkably, this was the status quo.