None of these European countries uses centralized planning, but instead they rely on pretty standard market economies.
The problem with the cited statistics is that even PPP-adjusted equivalized disposable household income that accounts for both cash and in-kind transfers still provides only a limited basis for comparison.
For example, observe that the average American person works 30% more than the average German or Dutch person [1]. It should not be surprising that shorter working hours are reflected in lower wages and lower household income.
However, while the reason for that is not always good – too many stay-at-home moms in Germany who'd rather pursue a career, for example – in general, this tends to express a voluntary trade-off of better work-life balance in lieu of higher income. This trade-off generally works because both income and expenses are less volatile; you may not need to save up as much for a rainy day, a huge coinsurance or deductible payment from a medical bill, for your kids' college funds, for the disruption of your income by a pregnancy, or figuring out how to pay for childcare. While few of these things have zero impact on your income situation, that impact tends to be greatly reduced. The modern European social democracy is less characterized by transfering cash from the rich to the poor, but by ensuring affordable essential services for everybody (which also tend to benefit the poor more than the rich and thus are typically redistributive).
In addition, even trying to normalize household income does not account for all the actual differences between the economies; for example, the effects on urban planning (suburban sprawl with a built-in dependence on cars vs. hybrid zones that are walkable, bikable, and have good public transport) can have a major impact on how you live. Likewise, the rise of helicopter parenting in some places comes with increasing demands on time and household budgets.
And while the Western European social democracies are not some magical paradise with both riches and year-long vacations (contrary to what some people seriously seem to believe), they are not socialist hellholes, either.
[1] https://en.wikipedia.org/wiki/Working_time