Americans don't fully understand what a pain in the ass it is for people in other countries to buy whatever they want. They are always paying some additional amount, if it's even available.
I'm not sure it's the same as what GP is saying. Maybe anecdotal, but living in Italy I had a very hard time finding a lot of things. Even getting basic mail delivery was pretty difficult. Same with Spain, to varying degrees.
As another example, visiting the Netherlands, it would take a week to get a decent child car seat delivered last year.
Comparing with the US, it's night and day. I can order something at 6AM and it's at my doorstep by 10AM. And the number of goods that are offered at that speed is absolutely astonishing.
As a side note, what the US has done to the shopping experience may not be preferable when considering all related effects on the market, happiness, etc. But it certainly sets a very high bar if you are comparing to Europe.
EDIT: I almost forgot to mention that all of this magical instant delivery is free!
