For the entirety of my life, we've hung or clothes to dry inside. No dryer. No, they don't smell bad. Yes, even with small kids in the household. No, there is no problem with mold. No, it doesn't take forever, I'd estimate twelve hours most of the year, depending on how fast you spun them (typically 1200+ rpm). Yes, the evaporating cools down the room, though I can't say I ever noticed it. In terms of energy efficien…
Have you only lived in one climate? One type of house? There are a lot of different buildings and climates where you will have problems hanging laundry indoors. It definitely can cause mould, it definitely is a health risk without paying extra for dehumidifiers. And dehumidifiers are not great for the environment either as well as costing extra. So two good reasons to hang out rather than in. Plus hanging laundry out…
That being said : I see what you mean. I grew up in France ( dryer don’t exists ) and it’s easy to dry stuff there. Except maybe in winter.
Now I’m in Louisiana… yeah, it’s humid. But if you put things in the sun it does dry super quick too.