Hey, Aussie here, who lived in London for a few years. I thought I would put in my perspective.
I agree, work/money/bills are the same everywhere, but I found it came down to the type of LIFE you like to live. As I had grown up is Australia, I’m used to being outdoors, and living outdoors. Instead of history, architecture, museums etc (as we are a young country in terms of European settlement, and don’t have a long traditional western history with buildings etc) we do outdoors-y things on our weekends and evenings - sports, bush walks, beach, surfing, picnics, hikes into waterfalls, canoeing etc, depending on where you live.
I now think of it as the difference between adults and kids at the beach. Adults might have one or two swims, read a book, stay under the umbrella, go for a walk. The Kids/teenagers will be in and out of the water all day, cricket, paddle boards, surfing, sand castles, jump waves etc. Kids will just think - great day let’s do it again! Adults might think, great, but let’s see an art gallery tomorrow.
In Australia, we are the kids. Happy with the outdoors and the occasional art gallery. Some (Only some!) of my UK friends Feel like the opposite - they prefer the outdoor lifestyle only occasionally but want the other stuff all the time, and we just don’t have that.
Also - you can go to any doctor you want, whenever you want (or can get a booking, which is usually same or next day). I never understood the ‘registering at one place’ thing when I was in London. Thank goodness I wasn’t sick much! (No criticism of the NHS and overall yea for both UK and Aust Governments understanding that health care is a right, not a privilege).