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I actually grew up in a McMansion. I always thought it was a great house. We had a pool, and two concrete lion statues guarding the front door. Thinking back on it makes me cringe. How could my parent's buy a house like that? It oozed with tackiness.If you’d grown up in a normal-sized house (maybe 1000–1800 sq. ft., depending on family size), you’d also have thought it was a “great house”.
Kids in general tend not to question their natural environment much. There are some amenities (electric lighting, hot showers, indoor plumbing, washing machines, telephones, HVAC, ...) which make a noticeable difference to quality of life compared to growing up in a wattle and daub shack with a dirt floor.
On the other hand, having an extra 6 miscellaneous rooms to store random crap, giant walk-in closets, 4 bathrooms, a huge home theater, or supersized bedrooms makes only a very slight difference to anyone, except insofar as it signals to the neighbors that you‘re rich and gives you 3x more cleaning to do.
My parents who grew up in families with 5 kids in tiny 3-bedroom 1-bathroom houses in the 50s thought their houses were great. I’m sure they would have appreciated 1–2 extra small bedrooms and an extra bathroom, but it wasn’t a big deal.
The much larger problem with McMansions is that they tend to be in suburbs with huge distances between places and streets actively hostile to pedestrians, cyclists, and public transit. Absolutely everything requires a car ride to get to: friends’ houses, the park, school, grocery stores, little shops, cafés, restaurants, the library, the doctor’s office, concert venues, museums, etc. Such an exterior/public environment is incredibly constricting for everyone, but especially for kids, the elderly, the disabled, and the poor.