" it is all individual"
Hell yes!
I'll admit to watching a TV program this week where a mum took her 5 month old baby to nursery for the first time. It choked me up, and I said to DH "I'd rather not have children than have to leave them in nursery at that age." DH laughed and said I was bizarre.
The thing is I didn't know I would feel like that before I had DC. DH likes to quote something I said when I was pregnant with DC1; "I won't be one of those mothers who never leaves my child. I'm just going to leave my baby with anyone and get on with my life." Oh, yes, I have eaten those words many times over, and thanked God I didn't need to work to eat and have a roof over my head.
The world is not perfect, and not everybody earns enough for a fabulous nanny or nursery, or has grandparents on tap.
KH can keep her opinions on coffee drinking, toddler group attending mums to herself, because no one really wants to hear it. Especially the bit about brains turning to mush, which is just rude and patronising. If you feel bored hanging out with your pre-school child, at least have the guts to say it. If you do find small children dull, it's a matter of personality, not intelligence, IMO.