Why has daycare/childcare been great for your little one? What's your arrangement like (daycare/in home day care/nanny...)?

I'll be going back as a teacher next fall--a ways off, I know!--and it's been on my mind. My LO will be just over a year old, and it seems so young to send her off every day, though I know people do it all the time.

So...tell me your success stories!