Firstly: agree that there are some aspects of travelling that will be looked down upon in the future, particularly exploiting the difference in the cost of living. But travelling was massively beneficial for me. I'll focus on the biggest trip, which was a year backpacking.
> what you guys who traveled actually gained from traveling the world?
* I worked and rented in another country. So I had to work out how to do that, and work in a different type of business environment.
* Developed key life skills: organising things, budgeting extremely tightly, Coped with emergencies abroad.
* Building confidence. For example, driving all kinds of vehicle, learning to speak to and bond with anyone at all from a cold start.
* Staying with families in different countries and seeing how they lived, how they treated their kids, and their priorities. This was very formative in deciding how to live my life.
* Understanding the politics of the world better. I spent time with a guy from the Economist who had just spent months sleeping rough in India. I still think about his insights into the way the world works. I played cards with a relative of the president of fiji. Etc.
* Understanding the history of the world better - for example, the origins of the industrial revolution in the USA, or the Ho Chi Minh tunnels, or the fate of aboriginal people in Australia.
* Physical fitness. Learnt to scuba dive, climbed mountains, rock climbed, hiked a gazillion miles, hell just carrying 25kg for the year was a good workout. Some of this could have been done in my own country, but it would have been very different.
* Removing stress and having space. After a while the stresses of travelling become fairly routine and you have a lot of time to relax on journeys and think about what you want to do with your life. That really shaped how I've lived since. Just sitting in a bus on a long road in a very different country you can watch how people live and it gets you thinking. How close are their families? Do I want to live like that? How do informal networks replace more structured western timetables etc.
* Gratitude. Live with a cold bucket of water for a shower for a while. Sleep in a hut full of rats. You'll soon learn to appreciate that hot shower in your bathroom and the comfy bed. Honestly, even now there are few days I forget to appreciate that shower when I step into it. And this trip was over 10 years ago.
* A very Hacker News point for me: I found I really missed computers. I didn't think I'd be a geek for the rest of my life but after that trip I realised how much I just like machines. Being in a different environment brought that into sharp focus, being deprived of it then (as a real example) coming across a Linux box in a hut somewhere. They're so neat and tidy and orderly and enabling, you can be endlessly creative. I only had a burner phone (and that was only for a part of the year) and this was the era of internet cafes, so no nerding for a year.
* Spending quite a while in one place, indeed learning a bit of the language, reading about the culture, and then through local contacts really experiencing ceremonies that were pretty out there by western standards. It helped me understand the diversity of the world, where different cultures were at, and the size of cultural boundaries.
* Friends. Met a lot of travellers. I did hardly any of the "party" backpacking thing but I met people on the way, and one couple I met have become life long friends.
* Seeing the extent of human suffering in the world. I'm not sure I want to say too much about this, but it really hammers home the message - we have a long way to go, and there are many problems to devote your life to.
* Understanding a lot about the universality of the human condition by seeing the same patterns in different places. For example, social drug taking.
* Finding "paradise" in several places, which shall remain nameless, and having that experience of dozing in a hammock on a beautiful beach that isn't on a tourist brochure. It was a beautiful experience but it also made it clear to me that just enjoying life was not enough for me. Have to build something.