I had a full time nanny and housekeeper when my children were small - we lived abroad so very much the norm there. Many people had more than one nanny, or one during the week, one at the weekend. Common to have a driver too.
My husband and I both worked full time and it was amazing to have someone as a constant in our children's lives and who we could rely on to look after the children, take to school, activities, host after school play dates, and if needed babysit so we could go out in the evening for work or pleasure.
It was massively convenient but I wouldn't say it meant I didn't know what parenting was like - I still spent evenings, nights, early mornings, weekends, long plane journeys and holidays with my children. And did school meetings, medical appointments, sports day, school plays and the rest. No real difference to working with a child in nursery really - except that my house was immaculate and there was no panic to pick up children at fixed times or find a babysitter at short notice.
Now we are back in the UK and use school plus childminder plus cleaner. This doesn't offer quite the same level of flexibility but unless someone wants to argue that by working I'm not parenting, there's little difference between our present set up (which I don't think is particularly unusual) and having full time help.
That said, where we were abroad there were lots of families who had so much help from nannies/housekeepers that I'm sure some really didn't know what to do with their children - it was quite common to see the nanny trailing behind Mum and the baby being passed off to the nanny as soon as they cried or needed a nappy change or it always being the nanny who was at the school play or sports day or weekend birthday parties instead of the parent.