I was worried I'd been a bit harsh there, but honestly, I get every feeling you're having.
It's a bitch of a couple of years that really drag out. First the test prep and worry, then the wait for results, then the months of waiting to see if your child got a place - I guess, with hindsight, I wish I'd been a lot more chill about it!
What I would say is, now that all of the kids are well into year 7 and parents are chatting about schooling, it seems like all of them are settled and, arguably, in the right place.
For a long time there everyone's focus was on just getting in, but looking at it now, a few of the kids who's parents forced them to do it would have really struggled at grammar but are happy at high school. Of the couple who just missed out, one is loving the sporting facilities of a private school while the other is flourishing in the praise and rewards that come with being one of the highest achievers in top set (whereas those rewards might not have come if surrounded by full classes of other high achievers in grammar). The couple that got in, including DS, are happy and finally surrounded by other boys like them.
I guess what I'm getting at is that in the end they are all happy and are where they are meant to be.
Hopefully you have both good grammars and high schools around you where DD can flourish whatever happens.
The 11+ isn't the be all and end all and really one of the best things I think DS got out of it was the realisation that he can achieve when he revises and that he has a love of learning.
Kids who know that will do well anywhere.x.