I really really enjoy if they need to sort out their differences first (enemies to lovers trope) because that way you already go into the relationship knowing most of your conflict points and know how to work around/solve them, you don't start off with rose-tinted glasses and then have the bad awakening. Through their differences they usually also compliment each other very well, like the cheerful optimist shows the grumpy pessimist to enjoy life a bit more while the pessimist can give the optimist a better sense for reality. The people-pleasing extrovert can help the snarky introvert find ways to deal with people better while the introvert helps the extrovert to draw a line and teaches them how to care for themselves. Of course they will be clashing at first but over the time and adjusting to each other, they can discover the qualities of the other as well.
Also, the more slowburn, the better! Endless secret pining because through false assumptions they don't realise it's mutual, yadda yadda. I love man-made problems But this applies on any kind of romance because I don't quite get the whole "love on first sight" thing.
Another trope I really like is when they start off as rivals. Mostly because it's often connected to playful banter that can become borderline flirting without the other really realising it. It also means they see each other on eye-level and also push each other to become better. It even can be kept in the eventual relationship, making them a total power-couple. It just becomes difficult and sometimes even toxic if they constantly stay in competition mode and don't stop comparing each other all the time.
I think that you oftentimes don't even recognize that it is highly abusive and toxic behaviour because the romance is mostly written in a way that we're supposed to sympathise with the stalker and/or should find them attractive. I was like, 13 when I read Twilight and I didn't realize Edward was a stalker and very manipulative person until I got to book 4 where he pressured Bella into having a different car and isolating her from her family. And that was only because Bella herself mentioned that it was weird.
The older you get, the easier it is to notice certain patterns/behaviours and can connect them to abusive behaviour more easily (and some creators are more blunt with it than others, like obvious rape scenes in doujinshi for example) but as an early teen you often can't quite differenciate, especially if no-one (or no-one the couple relies on for their opinion) in-universe explicitely marks it as something negative. Bella's dad, who eventually rises some concerns, has always been painted as the "overprotective dad" so no-one really takes him seriously in his warnings/doubts regarding Edward. He also doesn't know about the whole vampire/werewolf thing, which descredits his sense for what "actual danger" is even more.
I think the issue is much deeper layered than just "people seem to love something obviously dangerous." Some romances are also pretty much written how victims of abuse actually can slip into those relationships, the reader is basically manipulated the same way like the victim is. If you have plenty of those stories playing out with "they became happy ever after" without ever acknowledging that abuse is even happening, it's easy to believe that abusive behaviour is "romantic" if it's coming from your supposed "soulmate."
I maybe should put on a disclaimer that I definitely don't like this trope either and try to evade those kind of stories like the plague.
Luckily, more people gain awareness of it and promote change, so there's that at least.