On a positive not for K
We had a great K teacher. In fact she was the one who realized that my child was gifted. We were lucky in the fact that she also had 3 other gifted kids in her class, what are the odds of that! Our teacher was great at challenging our kids at their level. She had some kids learing to write their names and ABC while she was prompting our kids to write paragraphs some kids were practicing addition while other were doing multiplication. My DD loved K, she learned new songs, did cool crafts, and developed confidence. First was not quite as good because it was more structured and harder for the teacher deviate from the curric.
I think the teacher can make all the difference. I would check out the local school and sit in on some classes. You may find a great teacher who is able to multitask.
Thanks for your post and please keep us updated as many of us still have pre-schoolers we are worried about.