Daycare isn't solitary confinement. The kids there are hanging out with other kids and the daycare employees. Kids who hang out in a variety of different social situations like this actually end up better adjusted than kids who only hang out with their parents the whole time.

I remember preschool (i.e. private daycare) as being a hell of a lot of fun. Same for summer camps. And if it gave my parents a rest away from me, then good for them. I still saw enough of them every day.