I mean, I wouldn't leave an unattended laptop anywhere. Maybe the real test is "if you had forgotten your laptop at a coffee shop for ten minutes, what probability would you assign to going back there and successfully recovering it?".

For Greece, it would be pretty high, but I wouldn't just randomly leave a laptop, because the off chance of something happening is still not worth the trouble.

I had my phone fell from my pocket while in a dancing club at night. Someone found it, took it to the bartender and I got it back (saw the location on my computer using Google's find your phone).

But would I deliberately leave my phone or laptop unattended on the table at a random coffee shop that I know nothing about? Probably fine but not taking that risk. Also as others pointed out, context matters. A small indoor coffee shop while I visit the toilet? No problem. Large crowded outside terrace? I'm not stupid.

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Why? Stop reserving public or publicly available spots. I you leave anything from laptop to beach towel unattended for longer than 5 minutes you're an asshole.