It's just another country. I've been there, it has its quirks but is otherwise a fairly normal place. Bustling cities, boring countryside, good food when you find the smaller restaurants. It's also the place where I learned that cow tongue is delicious, and that there are different strengths of sake.
Though I will say, the area of Tokyo where they were selling spools of fiber optic cable and had women in maid outfits screaming into microphones was very strange. Everywhere else it was just normal people. Most people we actually had to interact with were also very polite.
Their subway system was nice and easy to navigate, it had everything written in English as well, so as long as you knew the name of the station you were fine. The 7-11's were also neat, as they didn't card you and had a bakery section. Beer, pastries, and candy all in one go!
Then again, I was only there 2 weeks with my family, with my brother (who was spending a year there) acting as a tour guide. But it was far from the magical land of...magic or whatever that all the Japanophiles at the "nerd table" I've talked too say it is. It's just another developed nation doing its own thing.