For me it was GoT, I just thought the miniature landscapes looked way too cool. Also I am watching Kimmy Unbreakable which has a theme song that I think is pretty catchy.
All of them. Why would I skip an intro? Intros are cool, and, rarely, they might change, possibly for in-show reasons. JoJo’s Bizarre Adventure is famous for doing this, and even some American shows have taken after it in that regard.