Having recently moved from an overwhelmingly urban are, the West Mids, to a diametrically opposed rural area, East Anglia, I have to agree. Miles of open green space with the odd house, hamlet, village and town dotted about. I think what also makes us think the country is more concrete than greenery is the amount of street lighting and its associated pollution, suggesting that the countryside is less than it really is.
We have about a third of an acre of back garden, according to the neighbours our seller was tempted to sell to a developer who would have built on it, how many I don't know, but it would apparently have made little difference in the grand scale of things but a huge difference to those who had to live with it.
A good read.