You're 100% right, that if I had better language skills I likely wouldn't have felt as isolated. I did try, and picked up some phrases, but intermittent trips rather than a contiguous multi-year stay made it more difficult.

That said, the difference between Japanese and Latin languages does play into the "foreign-ness" I mentioned. My very bad high school/college French is enough to feel comfortable deciphering a lot of Spanish and Italian, both written and spoken. Needless to say, that skill didn't transfer to Japan.

Again though, I love Japan because you truly feel as if you're in another culture. When I step off the plane in most countries, the first impression is sameness: same brands, same clothes, same affectations and language cadence. Flying to Japan truly feels like travel; I imagine it similar to going anywhere 100 years ago, before globalization (modulo British colonialism, of course).

It would be a heck of an adventure to commit to a few years' stay and really explore the country. I'd just want to do it with a partner to share the adventure with me.

I'm very happy you've had a great experience. I'm sure you will carry this with you regardless of where life's journey takes you.