I do think the weather makes a massive difference. Not temperature, but weather. Last week it was freezing, but it was generally sunny, you could go out for a walk wrapped up in suitable clothing and it was nice. Today it's damp so going for the same walk (and yes I do have suitable outdoor wear) means either changing shoes in the office or tramping wet mud around in my boots. My coat is damp and I've got to try and get it dry to go out at lunch. Whilst this kind of goes with the territory in January to some degree, it was the same in August, September this year when it should reliably be shorts and trainers for a day out.
I also think time is more under pressure now. The 9-5 is now the 8.30-6, plus the commutes as our overcrowded roads and public transport networks bulge because people don't live and work locally, and we are dependent on the car for the smallest journey like to the local shop, which people will say is due to safety but in reality is due to a) the above pressure on time and then b) laziness. Overcrowding doesn't help, and yes we are overcrowded in many areas. We need to stop population growth here rather than just building more and more houses without associated infrastructure. Contentious but we also need to stop keeping people alive at all costs. I watched my nan be 'kept alive' (this is different to living) and she was either distressed or had no idea what was going on for about 4 years, on such a concoction of drugs, I'm sure the stress was what contributed to my own mother's heart attack because she was so heavily leant on for personal care and all the admin whilst still trying to work full time in her early 60s. We do seem to have a very 'frail' elderly population compared to the areas in Europe I have friends/family enough to spend reasonable amount of time there (as opposed to only visiting on a city break weekend)
I also think the country is really dirty. Nowhere has bins any more in case someone sets them on fire or hides a bomb in them. How fucking depressing is that! No it doesn't excuse littering, but we were stopped at a regional swiss rail station the other week and there were proper bins inc recycling every 20m or so down the platform. In Paris in the spring, in the run up to the Olympics, on a random street alongside a road (not a main tourist centre area either) I could see, in line of sight, more bins than I walk past on my usually 5k dog walk loop round mostly new-ish build housing estates at home.
I know people in the most 'local' EU Countries have similar moans about their countries, and I think that living standards are just dropping off a cliff across all of the west, so stuff is compared to how stuff used to be.