It doesn't cut both ways. It may be socially acceptable to stay home with your children for 2 years, but it isn't career-acceptable. Read the thread: women are penalized for returning to the workforce.
I did lots and lots of volunteer work while I was a homemaker. I have a great many accomplishments to my name. But I have a lot of difficulty figuring out how to package it so it is taken seriously in a work environment. I am reminded of a comment made somewhere on HN about a member here volunteering on a project and not getting taken seriously because they were unpaid and saying they will never do that again because being unpaid so badly hurt their credibility.