So, not much then.
For the consumer devices, cheap = disposable, as opposed to consumer devices you bought and could use for decades.
Likewise, cheap clothes mean diminishing quality (regardless of price bracket, from $5 items to $200 brand-name ones, they are all most often than not made in sweatshops in the developing world, often with the same materials and processes). Plus tons of clothes thrown, which is an environmental attrocity.
(As for cheap music and movies, that's a byproduct of one basic delevopment: high speed internet, which enabled a new delivery method. Not the best example of an increase in productivity, not to mention those are passtimes).
As for "longer life expectancy", all accounts I've read say that we got that early on in the 20th century, so 100+ years ago, and it was due to running water, bathrooms, hand washing, and a few such things. Low hanging fruit. Certainly not due to the last 70+ years of "increased productivity".
Meanwhile we pay more for healthcare, housing, and education (the 3 things that matter more), wages have stagnated since the 70s, and work-life balance has gotten infinitely worse, depression ever more prevalent, the middle and working classes have collapsed, and so on. No savings and no chance of retirement at any reasonable age for the majority as well.
>I'm often surprised about this idea we've got it worse off.
Probably it's from people who are not impressed by more and cheaper trinkets.