In general, I was impressed with just about everything.
Brain dump below:
I think the most striking thing to me was how little stress I felt just existing. I have terrible luck being approached by generally unpleasant people in the USA and Canada, and have a seemingly unending list of weird encounter stories.
I noticed in Tokyo that it's basically safe to dress in a feminine way, which isn't really true in the US (and to a lesser extent, in Canada). I mean, yeah, it's safe if you're in a Designated Human Gathering Area (malls, restaurants, etc), but in the in-between spaces you can deal with some particularly vile harassment if you present in a feminine way. (I still deal with an unfortunate amount of harassment just walking around in the USA in gender-neutral clothes, but dresses make it 5x worse.)
Also, speaking of "in-between" spaces, there are far fewer places like that in general in Tokyo just because... well, the city is largely transit-oriented. Most places are packed full of stuff. Residential neighborhoods also have small businesses in them because Japanese zoning laws are different. It's also really easy to build and remake places which aren't being used efficiently. So, you never really feel like you're nowhere.
Walking in Tokyo was extremely relaxing. Despite being a massive, massive city, it was quieter than my apartment in San Jose. I've gotten used to basically Car Background Noise at all times. That basically does not exist in Tokyo, so in general, the ambient noise is just... less?
Tokyo does not prioritize cars. There is no on-street parking. You need a parking spot in order to own a car. So, most people don't. To support that, the city offers extremely reliable transit which spans basically everywhere. People often own bicycles; e-bikes were extremely common too. I noticed that there was care into making the streets accessible as well. In particular, there was a lot of focus on accessibility for the blind. There was a lane of tactile paving in the middle of every sidewalk, and every sidewalk was extremely wide. Every crossing was automated, but had a button to make it play a sound when the walk indicator is active.