I think it depends on each individual situation. When my first was born, I lived 5 minutes from my grandmother, who watched her anytime I needed it. I was able to go back to work and know she was being loved and taken care of. I never thought I would use daycare. I had heard tons of horror stories. When she turned 3, we moved to Indiana and I went back to school. So out of necessity, she had to go to daycare. I was the only one who took care of her. I found a wonderful daycare that was attached to the university and hospital. They were wonderful with her. She got field trips and a classroom setting. In fact, the were able to potty train her when my grandmother and myself could not. She was never sick. In fact, there was abig issue, while I was going through chemo if she should be around other kids, and bring home their germs, but it worked out great. I never got sick.
When I went back to work after my second, he was about a year old. It was a nightmare. He ended up with an eye infection and respitory infection the first week. The doctor said it would take about 6 months for his immune system to get on track with the daycare center. Which meant he would be sick all the time until his body developed an immuity to their germs. He was already a sick baby. I couldn't handle him being worse. So I took him out. Now he is turning three in a few months and I am considering it again. Even though I am a SAHM, I think he needs the socialization with other children. I take him on playdates and other adventures but its not the same as a classroom setting with other adults away from mommy. They always listen to other adults before they listen to parents. What do we know?
If daycare becomes a necessity, there are good centers out there that have workers that treat the children as their own. They use proper sanitation methods to get down on germs. They have education programs that give the kids a headstart. It takes a lot of research and looking around.