It can make a massive difference. I grew up in village near Portsmouth (UK, metro area population 1.5 million according to Wikipedia), and the night sky was bright orange whenever it was cloudy.

I now live in Berlin (6.1 million metro population), and although it isn’t perfect darkness, it is vastly better even though I’m in a built-up part of the city rather than a rural part of the city equivalent to my childhood area in the UK.