Nannies, are they Good or Bad for Our Children?

Today at the playground, my son looked at me and said:" mama, why are you standing next to me, only nannies are allowed!" I looked around and he was right, it was mostly nannies with the kids. Not that I'm judging, on the contrary, my daughter was on the other side of the playground playing with a nanny herself but it got me thinking. Do we depend too much on nannies? A month back I was in the states, all I saw were mamas with their kids. Of course, they might have also been baby sitters without me knowing the difference, but it was obvious that almost 90% of the kids were with their parents alone. On the other hand, the babas were completely involved as well. If the mama is carrying one, the second was with baba. It's a cultural thing I guess, add to it how expensive it is in other places to hire a live-in nanny but still, are our children getting too dependent on having help around? I have seen six and seven-year-olds being helped with their shoes today, that can't be right. Live in nannies, blessing or a recipe for spoiled and dependent children?