Yeah, it is getting popular lately to work in cafes. Sometime working at home can have too many distraction.
Eavesdropping is also something I can't help. I used to work in a restaurant myself sometime knowing these details helps us in better service and up until now I still have that habit.
I can relate to this. I don't like to eavesdrop, but unconsciously, I listen to peoples conversation. The information has been useful sometimes as you have stated.
Enjoy a slice of !PIZZA