http://www.smh.com.au/lifestyle/life/why-lazy-parents-make-happy-families-20110824-1j94e.html. The article talks about giving kids enough free time in their life so that they are forced to get bored, which then makes them more creative and inventive.
I'm a bit of a lazy parent (as in, I'm happy for them to work out ways to entertain themselves that don't involve me), but during term time our life is crazy. It's partly because of the number of children. Each child doesn't have lots on, but they often have to come along to each other's activities. Plus homework, chores, baths, music practice - the time disappears during the week.
But weekends are generally reasonably quiet and the school holidays are glorious weeks of unstructured time. The holidays are very precious times. Some kids are better at entertaining themselves than others. The easy option for some of them is to watch TV or use the computer - but once I say no, they get cranky, realise I actually mean it, they'll go and find something else to do. Often with a sibling - those are the times when I say a big 'yay' for lots of kids.
I'd quite like to read the book referred to in the article- but I suspect that the main concept was summarised in the newspaper article - so maybe not.