I hope you all slid safely over?
I just don’t want the kids to be standing in bed when someone is blow-drying their hair or showering in the bathroom...
But that will probably happen if you use the bathroom in the middle of the children's room in the morning. At least in your plan, your fear is justified! From your point of view, you shouldn't place the bathroom between the rooms.
Personally, I always wonder what parents think about how their children or other family members might react to ambient noises.
In my opinion, no one has a problem with noises when people treat each other considerately – not even toilet flushes or other water sounds.
Well then... happy new year :)