I think I started to appreciate all of it around 1996-1997. I'm 1 of those people who 'discovered' skating because of the extra coverage due to the scandal. Skaters used to set up a lutz jump differently in the '90s, it was easier to recognize for me. Nowadays a lot of times I don't recognize a flip from a lutz. The other jumps I still do recognize. I remember people talking in the '90s about flutzes, it wasn't as important as now, but at the time I didn't really care much about that and neither did most skating fans as far as I remember. I didn't recognize flutzes myself though, skating commentators would point things out like:"and here she changes to the outside edge for the correct take off at the last minute so ... blablabla", that would give me some understanding.
I have to mention footwork. When I first started watching skating, spirals and jumps obsessed me. I loved the ladies events and pairs. I didn't enjoy the men's programs very much, to me they were less artistic and there were few programs I liked. I liked the elements of ladies skating much better too so that influenced me as well in liking ladies skating more (such as spirals of course, but also layback spins, I still love those). I had no idea about difficulty of footwork though. And in the 90s, most people had a lot of similar steps! Only after following the sport for a few seasons did I understand what difficult footwork was and why that was also an important part of skating. I remember a commentator gushing over a skater who did a lot of footwork on 1 foot, I had no idea that that was special and difficult.
And o yes, the edges of spirals, I just liked the well done beautiful spirals with the lovely positions, I had no idea about spirals on deep outside edges for example. That also took time to understand and appreciate. Or simple things like a skater not "scratching" much when skating. And how about bended knees? That one really confused me for a long time, what did they mean?
Ice dance was the last discipline I began appreciating more. Now I like all the disciplines, some eras do have better ice dance programs or more enjoyable pairs or nicer ladies or mens programs, so it also depends on the kind of skating we are seeing. It does take a few years I think, before people like me, who aren't skaters, can appreciate 'all' of skating and even then, I'm sure there are elements we still don't understand.
I also understood the thread title as appreciating all disciplines btw

For me that would be: ladies first (pun intended, my apologies for my cringy Mum joke, if any young person is reading this and if you had the patience to come to this sentence, I do hope you will have a better weekend than this), pairs, men and last but not least the ice dance.