There's a lot of pressure when scheduling events to try to maximize the number of sessions accepted and given. But, yeah, the last time I was at FOSDEM, I decided to pretty much hang out in specific devrooms and it was a much better experience than trying to run from session to session.
Last year I attended FOSDEM not for the talks but for meeting people, the social events and the stickers. It was fun event and I watched a few talk that I wanted to watch after FOSDEM.
Definitely for meeting people. Also recorded some podcasts. Haven't attended any of the formal social events for years though. The event's grown too big for that sort of thing to be pleasant for me.
My current one is Innovate @Open. Most of the content I recorded at FOSDEM was for a series on whether open source was inevitable but I also did a couple standalone episodes.