I just smile politely, and respond with, "No, we plan on homeschooling," to which I generally receive a funny look in return. Some respond with great favor while others get verbally defensive. The latter usually back off when I explain which school district we are in, which is a really good indicator that I SHOULD NOT send my child to such a school.
To be honest, I don't think I could send my child away. I don't think I could wait with him at the end of our driveway and willingly place him in a school bus driven by a stranger and full of children we've never met before. I don't like the idea of him being away from me for 6-7 hours in a day in the hands of people I barely know where I can't see what he's doing and what others are doing around and to him. I can't tell what his influences are. It boggles my mind that I'm expected to do this with my 4 (or 5) year old little boy!!
That's just me. I'm not saying moms who do send their kids away are somehow wrong. I just personally can't justify it with my own child.
And yes, a part of me does like the nostalgic (and convenient) idea of sending my child off to school as I was sent off. But, when it comes to reality, I think as soon as those school bus doors opened to receive him, I'd grab my son and run for the house.