When you initially quit, were you thinking you'd find a new position that you were passionate about and then it didn't materialize, forcing you to go back to your previous life?
My perspective now is that there are two ends of the work/life balance spectrum you should avoid. The first is not working at all, or working as little as possible. This would include doing something far below what you are capable of like working at a grocery store just because there is no stress and you can manage to get by on that type of income. Lots of people fall into a lifestyle where they realize they don't want to be materialistic, so they never get a career going, and then they pay serious consequences as they get older and have no money or freedom.
The other end of the spectrum to avoid is materialism. Measuring your self worth in status, or seeking status, especially through money, is a challenging thing to avoid at least in the US. Being close minded and materialistic, in my opinion, is robbing yourself of experiencing life in the way it can be experienced, because it makes it hard to build good relationships or empathize with people. Materialism is a huge huge issue in our society and it is something that too many people who start making lots of money take for granted, and this is ultimately rooted in fear and insecurity.
I think I was pushed down the path of materialism by default. I was an insecure twentysomething who was working hard at something that didn't make me happy, and everyone was telling me how well I was doing and to keep at it. The more I made it a part of me the more unhappy I became until I eventually quit.
When I quit and started hanging out with people who had also quit (or never started) I felt like a weight had been lifted off of me and that I was now living the dream. Eventually I realized how lucky I had been to have the career I had, and backed off of the path I was on by starting to work again, but with a much better sense of balance and perspective.