Most important thing for people completely new to line drying (not OP) is that you no longer put on a wash when you want to, you wash when the weather will allow you to dry it outside afterwards. The more so in winter. Some people struggle with this re-ordering of our place in the world :)
Winter drying.
Even a short spell outside will pick up the line-dried smell, before indoors to drape over wherever.
Things do slowly freeze-dry outside, even in baltic temps, especially if it's windy. Weight seems to be a good guide. If your frozen solid garment shapes feel light, they might be dry-ish. Finish on clothes-hangers hung from curtain rails, or wherever. If they feel heavy, then when you bring them into the warm, and stack them neatly against a wall until they're pliable, they'll collapse into a soggy puddle on the floor. Only extensive practice lets you gauge which is which.
Always wondered what winter freeze drying is doing to the fibres ... ?
Longer drying times outside and limited daylight means greater risk of being darked on and the dreaded spider willies. Personally I like clothes dried by starlight best of all.
Summer is the time when all blankets, curtains, under-bedding, sheepskins etc are washed and dried outside. Not winter. Woollens are hand-washed in summer, in winter airing on the line is fine, no washing necessary. The magic of real wool.
(Gods I miss line-drying. It's not home without a washing line. Even in the frozen north.)
Indoor airers. After years of traditional wooden concertina airers which are awkward, heavy and go mouldy, I discovered Lakeland do an extra-wide model with aluminium bars. Lightweight, no mold, fewer trapped fingers and lots more space.