I see Iron Maiden is leading, and I have heard many people mention them when this topic comes up. Over the last 30 years (high school in the early 80's), I have tried to like them, but it just doesn't click with me. I've had "Trooper," "Run for the Hills," and "Fear of the Dark," on my ipod or phone for many years, but this is a band where I can't find a single song that I really, really like (I do like the genre, though, so it's not that).
I'm not putting anyone down for liking them. I think it's great they have such a big following. Just not for me.