You probably played through vanilla all the way to MoP. You will reach a point where you've seen it all. I also played since launch, and quit raiding when WotLK came to an end. But the lore, additional gameplay features remain interesting. I like to be up-to-date on this game because I love the lore, and Blizzard games in general (Give Overwatch!). I will probably pick up WoD a few months along the path and enjoy the experience, but no more raiding.