As a European who currently lives in the US, washes and line dries his clothes, I don’t think mainlanders are missing much. It IS convenient but I’d rather extend the clothes lifespan.
I (American) kind of learned accidentally how much longer clothes last air drying, from drying work clothes and some of my child's clothes, and then expanding from there.
I kind of grew up with line drying, and then stopped, and then started again.
It is pretty remarkable how much longer clothes last with line drying. I only machine dry heavy items that take awhile to dry and/or benefit from it specifically in terms of fluffing up or wrinkling.
I'm tempted to get a heat pump dryer but I'm worried about the size of the ones that are available near me.