It's not necessarily about introversion and extroversion. I'm a natural introvert, and I also have working at home. I want a strong, clear boundary between work and personal activities. It's not so much about being in an office; it's about being a place that isn't home.

You need a home office for your own sanity, this much is true. I found this out the first year when the kids were out of school. Many others I've talked to also found satisfaction in co-working centers.