My dck's are all under 2, so I do have to be there with them and watching all the time, but I do not feel the need to be interacting with them at all times. I do try to teach them things and spend a little time with each child throughout the day, as well as sing songs, read stories, etc. However, not only is free-play good for us, but I believe that kids NEED it and need lots of it! I think that's how they learn most, not through circle time and adult-directed activities; it's not that I am against that, but I just think that until 3 or 4, it is not necessary as everything they do is a learning opportunity.