Japanese definitely seem to love cleanliness or at least they respect the others. There is less garbage along the freeways or on the parking lots in comparison with most other countries. Needless to say that there is always the exception to the rule. I watched a guy buy a pack of cigarettes from a vending machine and dropping the wrapping right there and then on the ground. Garbage, by the way, is supposed to be packed in transparent bags so that sanitary engineers can inspect the trash to make sure that people are separating trash from recyclables.
Many people associate Tokyo with crowds and streets teeming with people.
The international airport in Narita only has two runways, as far as I could tell. While certain areas of the city are crowded they are crowded in a comfortable way. I have never felt uncomfortable or crammed. Most areas such as the financial district and most of the northern and eastern portions of the city have enough room to stroll around freely. At night one can even feel lonely in these areas.