I think there may be a generation gap. Most older people I know don't even think to look it up. Many younger people instinctively look it up
I'm not denying it can be fun to debate and guess but there are plenty of times it just better to look it up and then move on to deeper more meaningful conversation
There's a difference between bandying around ideas and simple facts. 'Population of Greece' is a simple fact. 'Ramifications of overpopulation of Greece' is an idea. Making a conversation out of trying to guess at simple facts is like making small talk, in my opinion. Sure, it can grease the wheels if you don't know someone well, but among friends, it's a waste of time.
I'm not denying it can be fun to debate and guess but there are plenty of times it just better to look it up and then move on to deeper more meaningful conversation