I think it's interesting that PJII was very popular with Catholics and possibly less so with non-Christian. Despite or because being more conservative? He was also a very good man and humble.
JPII was a long running Pope. I would guess most people wouldn't know how conservative or not he was, or even what means in the context of the Catholic Church. He was the first Pope many of us knew, and the Pope who was with many of us the longest. He is probably most well known for the pope mobile.
He actively visited other countries and celebrated massive masses. I believe he was the first Pope to travel around the world bringing his faith. He also efficiently used the media.
JP was a great communicator. He understood what it meant for the church to talk to the people—first by traveling to many countries and in opposition to communist atheism, later with the organization of the Journee Mondiale de la Jeunesse. During the late 90s there was a pretty big Catholic spiritual movement towards boys and girls in their late teens or early 20s and it's crazy how big the JMJ was.
His trick was hiding the conservative positions behind the mask of the beloved communicator.
He also covered up sexual abuses, game power to the Opus Dei, and aggressively pushed the disgusting mandate against condoms in the middle of the AIDS pandemic. Yeah, not a fan.