When I visited Tokyo in 2008 I felt the same thing upon my return home. The transportation systems are efficient, punctual, and clean. People paid for their meals, bought snacks, and took the subway using their phone to pay for all of it. People were, with few exceptions, polite and helpful despite my boorish attempts to fit in.
Everything... it's so well thought out. You hand the store clerk your yen on a small tray. You can swipe your phone at a vending machine to get a quick bottle of water. You can walk from a bustling interstitial arcade into a quiet shrine. It seems like everything is meticulous and considered.
Even the seediest clubs in Roppongi or the dirtiest punk bars I could find still maintained the propriety and concern for others I found everywhere else. After one show the band passed around a bucket for some yen and we all sat down together and had food and drinks. One of the kids I came with made sure I got on the right train before the subway shut down. Even as a foreigner I could find people who were concerned about me as they were for everyone else.
Arriving back in Canada, where I'm from, was not what I had expected. The streets are haphazard and practical without a consideration for how it looks. People are louder. Traffic is thick. Litter abounds. Turnstiles, ticket booths, and grumpy ticket booth operators. Pushing... always the pushing. I had to wait a while before Street Fighter 4 would come across the Pacific so I could play it again... and 7 years for Apple to announce that you may eventually be able to buy a Coke with your phone in certain regions. Coming back to Canada felt like walking backwards in time.