I fully agree with aidos. It's much more rewarding if you go to a place and live like a local. In my case I've done a few voluntary work trips, the longest I did together with my wife and it lasted a year. I always try to learn the language in countries when I stay more than a couple of weeks. It quickly breaks the ice when you work side-by-side with the locals, trying to speak their language. You may not get to see…
Could you elaborate on what you mean when you say you feel disconnected from others when you get back? Do you mean in the sense that you feel their understanding of the world is limited compared to yours because you've seen/experienced more of it? Or in the sense that you had a different kind of fun/adventure that they'll never experience or know about?
I went on a trip to Pakistan and on return, it's like I can strike a conversation with a Pakistani/Indian/Nepali anytime anywhere but with a Chinese or Caucasian (I'm Asian Australian)? It's harder to build rapport and feel connected in conversation. It's still possible, but I notice it takes a little more time. I think it'll even out over time, though, since I wasn't in Pakistan too long.
The author of the parent comment may have a different perspective.