Granted, I didn't quit my job, but after graduate school I moved to Germany from the US and took a job consulting. For three years I lived in places like Berlin, Madrid, Split...etc for 3-9 months at a time. There were enjoyable things about it, sure, but I really underestimated how difficult it was to discard your entire social circle and start over. A few years ago I moved back to the US, in a city where a lot of my friends had moved to, and it was probably the most positive decision I've ever made in my life.
I also feel like my time abroad didn't "broaden my horizons" all that much, and I find myself skeptical about the claims that international travel makes you a better person. I think what you get out of travel is heavily based on how you decide to relate to places and people, and merely leaving your country does not guarantee this will change.