I'm actually rethinking this right now.
Where I'm living now, the bicycling culture is virtually non-existent. There's no market for bikes, and bike theft is pretty rare as a result... So often if I was going into the corner store for a few things and would only be gone for a couple of minutes, I'd just park where I could watch it on their security monitor. However, the other day my son went outside and found two teenagers inspecting and discussing whether or not to steal my bike. After he stared them down, they headed over to where HIS bike was parked and looked to see if he was watching. So basically I'm back to locking it up always, like I did in California.
I friggin' hate people.