Depends which bit you go to + which time of year
Cities & large towns like London, York, Birmingham, Leeds, Manchester = large crowds most the time.
Small & Medium towns not so crowded, except if they've got an annual event on (e.g. Whitby Regatta, Pickering Traction Engine Rally, NYMR War time weekend / Steam Gala, etc).
Sutton Bank in North Yorkshire about a month ago (described as "England's finest view).... yet only saw about 10-15 other people around, if that.
Blakey Ridge Road in North Yorkshire........ hardly see anyone there either (except when you get to the Lion Inn).
Michigan is fairly rural once you get north of Detroit though, isn't it? You have thousands of square miles of forests. And over 40% of the total area is taken up by lakes.
Cities in the UK do get quite crowded, but there is still plenty of quiet towns, villages and countryside. We're only number 53 on the list of countries by population density, so things could be a lot worse.
The great majority of the UK is rural and sparsely populated.
Some examples would be Cornwall in the southwest of England, Northumberland in the northeast of England, mid-Wales, the highlands of Scotland, Cumbria in northwest England.
I regularly make a 370 mile journey from Blackpool in northwest England to Truro in southwest England.
As I drive, for the vast majority of the journey, I am surrounded by lovely rolling countryside and open moorland.
Smaller houses! Certainly I tend to find American houses to be huge, and most of us are in cities. Particularly London, which is around 30 miles across and contains 8 million people - so that accounts for almost a sixth of us for starters. Having grown up in outer London, my parents never learned to drive as there is so much public transport, so that's one way of coping with the fact that driving in central London could be considered a sign of insanity.
Town planning helps - you can't build anything without planning permission, and around the edge of London there is much that is designated as "Green Belt" to stop it becoming too urban. I happen to live in the green belt. It has to be said that London has expanded massively over the last century or so. When London Underground trains arrived where I live in 1904, it was still a small village. Not any more, as the trains encouraged it to grow. But we still have the second largest area of woods in Greater London. When I take the bus to see my Mum (who lives not too far away just outside the London boundary), a lot of the trip looks distinctly rural.
But cities only account for a small proportion of the area. There is still plenty of room for farms, mountains (which occupy most of Scotland), woods, and areas of, well, not much except geography, such as most of the Peak District and the hillier parts of Scotland and Wales. Take a train or drive around England and most of what you see is, as William Blake wrote, "England's green and pleasant land".
And pleasant to us it is, too... the damp weather means it can't help being green, we're not in an earthquake zone (we get little ones but the undisputed all-time death toll from them is 1, who died when some loose church masonry fell on him), and there is no particularly dangerous wildlife. About the biggest wild animal we've got is the red deer, and there is precisely one species of poisonous snake. The biggest natural problem tends to be flooding in very heavy rain - but apart from that, what's not to love?
You should ask the Dutch, who have an even higher population density!
Most people dwell in the large towns and cities. Living in them is similar to living in towns and cities in Michigan. However, if you look at Google Earth, you will see that most of the land area of UK is rural with farms and small villages.
I live in a village in The New Forest (south of England). It's surrounded by woods, fields and heathland. I step out of my garden and walk my dogs among ponies, cows, deer, rabbits etc. I can hear wild birds all day.
Look at a map of the UK .!!! .There are loads of non built up areas.....I am looking out of my window now, just over a mile from the centre of one of our major conurbations, and there is a lot of greenery around and a park across the road...One of the biggest parks in Europe is a couple of miles out from here and then you are into fairly open countryside.....
It sounds as if you already have all the statistics you need to answer your question about the population density of the UK. What are you really asking?
Not very actually, outside of cities. We don't have the sprawl from cities and towns that you do, building has to cease at a certain spot, and much of the country is rural farmland.
By about 60% we should have stopped Imigration in 1955
now there is No where to go for peace and Quite and everywhere there is queues
you should have researched a bit more ...the world thinks we are overcrowded ....so ..how much of the uk is populated ? less than 8%....92% countryside and farms .....now if only the government would stop letting everybody in ...and giving them loads of free money