Yep. The countryside is packed! I'm just back from Provence where we were walking for about 8 hours a day, we, literally, would see a couple of people a day away from the car parks. It was very similar in the Cevennes last year.
Having said that, I suspect the UK may well still be the country with the highest percentage of keen birders. But it is an aging population. There are young birders but far fewer than there were. In the area I live, I know more young general naturalists rather than birders. I know most birders are into other groups but these people are more likely to know the identification features of digger wasps than acro warblers.