I'm just trusting. My MBP 17" sits at my desk all day hooked up to a 30" LCD and I leave it there 24/7 unless I have to take it home for an intensive project.
I'll go to coffee shops two days a week and yeah leave the MacBook Air unattended. I've never had a computer stolen and I've left it in some pretty risky areas. 8 hours at a coffee shop and I've got an iPhone, headphones and power plugged in. i'll just close the lid, throw my backpack on top of it and go use the bathroom. Been doing that for the past 4+ years. no problem yet.
I'll go to coffee shops two days a week and yeah leave the MacBook Air unattended. I've never had a computer stolen and I've left it in some pretty risky areas. 8 hours at a coffee shop and I've got an iPhone, headphones and power plugged in. i'll just close the lid, throw my backpack on top of it and go use the bathroom. Been doing that for the past 4+ years. no problem yet.