I hate the idea of 'popping in' all the time too!
However OP, you have a point, there is a down side to the move towards woman being out of the home and in work, the down side is when you are just first a mum you don't have lots of other female family members around you who are also housewives. That said, I would take that 6-12 month "down side" over not having a 30-40 year career working life. I like that I wasn't expected to resign when I got married.
Personally, I didn't find having DCs isolating, but I made an effort from DS being about 2 weeks old to make sure I went out daily, to baby groups, visit the woman I met on my antenatel course (having set it up in advance, see above about hating popping in on people or others popping in on me!), and built a network of 'mum friends'. Perhaps it helped I'd moved to this area when pregnant so I was aware I need to meet people, I suppose if you'd lived in an area for a long time and felt you knew a lot of people it might not occur to you that you needed to make new friends if they all worked fulltime.
And let's not sugar coat this, the reason it would take a village to raise a child in a lot of cultures wasn't so the mum could put her feet up and watch some trash TV for an hour or so, it's so the mum can go do things like fetch water, tend to crops and lifestock, clean without hoovers, washing machines, dishwashers, cleaning products, cook without a nice oven you just switch on, foods that have to be completely prepared from scratch (few people in the West consider 'preparing from scratch' to include grinding your own flour), and in many cases, just take on paid work within the home. It takes a village because the mum can't just do it by herself and run a home which is a full time job in many less developed parts of the world.
We also have the option of going back to work early if we want to. A lot of woman do only take 4-5 months off post birth, that's perfectly valid choice in our society, I'm very glad I have choices.