I’m making a great deal of assumptions but not being able to go to Disney land at the drop of a hat seems awfully trite.
Dual income families are — and for decades have been — spending their extra second income on housing rather than the rest of the economy. The comment you’re referring to is therefore very relevant because it shows that trend in action. Housing — and other opportunities in life it enables, like access to schools, (real life) social networks, safety, etc. — supersedes everything else in importance for many families, so second incomes are just spent on what is ultimately a bidding war over housing.
If the highest-earners of the middle-class have their discretionary income locked up in housing costs, how much more difficult is it for those who don't have the same level of income. Housing then eats into non-discretionary expenses.
And as a non-American, from an ex-Communist state, where salaries are still a fraction of those in the US, that standard of living sounds anything but affluent. Here, families with two upper-middle-class incomes and 1-3 children are more likely to own multiple houses, than barely be keeping up with their mortgage. It's just another story for the growing pile of reasons to never move to the US. Being in the top 5-10% of earners and in debt just from housing is not normal.
The main point is that these are presumably upper-middle class families. You would expect that with their higher-than-average incomes they would have greater amounts of discretionary income that they would be spending and that their expenses would be spread out across more of the economy, supporting many other businesses and services. Instead the high salaries are being captured by housing costs. Sure they're not hurting, but it is surprising that dual-income, high-earning families are basically breaking even.