Are they? GDP is a measure of national economic success not of personal economic success.
The latter is measured by metrics such as: value of a home relative to wages, value of rent relative to average wage, disposable income relative to the prices, food prices relative to wages.
These are the numbers you don't often hear about in the media, you only tend to hear about GDP and the time derivative of prices, neither of which have much relevance to ordinary people.
Another example is constant controversy over Elite College Admissions, ignoring the 99% of perfectly good but not as reputable State Colleges with high admissions rates.
I have no clue why you would think this. Basically ever poor person I know (and I know a lot of poor people) has simply given up on ever experiencing home ownership. None of them can afford to live by themselves. High density or low density, zoning laws, etc, don't even enter the picture because not one of those will actually bring housing into any kind of affordable range. It's just that politicians refuse to campaign on anything but "what type of housing supply should we hope developers build—low or high density" that there's any confusion here.
What I'm trying to say is that there is an explanation for why this sentiment exists despite measures of material wealth and economic success being positive.
The fact that there is an explanation doesn't magically make people feel better.
I think it all boils down to the attitude one has towards seeking explaination.
One is a scientific approach where one aims at understanding the dynamics of a phenomenon in a way that is detached from it as much as possible.
The other approach is moral one where one seeks an explanation in order to convince oneself (and others) how one should feel about it. "You shouldn't complain, you have indoor plumbing your grandparents had to pump water from a well; shut up".
I'm not making the latter, moral, argument. I'm trying to make the scientific one