People experience that because we (still, mostly) need to live where there is work. So people do. Work for a lot of people = cities, offices, infrastructure, transport etc. I won't argue that our infrastructure like public transport struggle, but that is not because of overpopulation, that is because of terrible privatised services and struggling local economies.
You can't hide the fact that only 6% of the UK is built-on;
https://www.sheffield.ac.uk/news/nr/land-cover-atlas-uk-1.744440#:~:text=The UK is a green,at the University of Sheffield.
or actually this is a nicer interactive link from the BBC;
https://www.bbc.co.uk/news/uk-41901294
Perhaps with more companies and business becoming more open to remote working our population can spread out a bit more and enjoy our green and pleasant land.