I honestly wouldn't trade the experience for anything, but am not in a hurry to get back into either!
A couple of other points-I spent most of high school and a lot of college feeling like I was the "smartest kid in the class" at least in many circumstances-especially when it came to the subjects that interested me(chemistry). I lived and breathed Chemistry in college, and still keep in regular touch with my undergrad professors-in fact I even still get calls occasionally about an apparatus that I set up 6 or 7 years ago asking how to use it!
Going to graduate school was an extremely humbling experience-where I'd formerly been at the top of the class, I was suddenly surrounded by people who were both shared my passion
and were at least as smart and in most cases smarter than I was. I was also very quickly made aware of how
little I knew-and every path one goes down leads to even more things to know. Of course, this is a lot of the point of graduate school-you should find yourself at a "dead end" and it's
your responsibility to find out more.
The second thing is that it was the first time in my life that I'd been immersed in a truly diverse environment. I had never been completely shelted, but even at that most of the folks I'd known from other cultures were second or third generation Americans.
I got to graduate school, and my WASP self(the dominant make up of both my high school and college) was surrounded by folks from India, Nepal, Bangladesh, Germany, France, China, Australia, Ghana, Nigeria, Peru, Columbia, and I'm sure other countries I'm forgetting. Heck, even of the(few) White Americans there, most were Catholic, meaning that I almost felt like the token WASP in the department

. In many cases, my relationships weren't just the typical casual work interactions-I was invited to(and attended) weddings of different cultures, celebrated birthdays(both for co-workers and their children), spent other time with them out of work, and spent extensive working with some of them(working on the same projects and either receiving or giving training) one on one. Yes, this is just a microcosm of culture and certainly isn't representative of the whole. At the same time, though, I was exposed to folks from different regions of India and China, and had many lessons in how varied the cultures of these huge countries can be(much like America). I can't say that all experiences were positive-there were a few folks from who I ended up genuinely disliking, although it was their own personality that did that. Out of 1.2 billion people in India, it's not surprising that I'd encounter one or two over here that I'd just have a personality clash with-much as I've had happen with Americans I've known.
In turn, I got to share a little bit of what I know of America as a boy who's spent the majority of his life in Central Kentucky. I chauferred many around and acted as a tour guide to favorite recreation spots. I took many to shoot guns-an experience often not available in their home country. I often intentionally used American idioms with folks I knew well, specifically to give them the chance to learn things that books rarely teach.
I've made many friends from other cultures, and many that I still stay in contact with despite the fact that they've moved on to the working world-sometimes across the country or around the world.
Without traveling the world, I think that graduate school was one of the most "culturally immersive" experience I've had, and it was all done 60 miles from where I was born.