True, but it's gotten a lot more frequent on recent albums. On AMOLAD, I think (off the top of my head), there are three songs that don't follow that style (Different World, The Pilgrim, Out of the Shadows), whereas you might have one or two on past albums (again, off the top of my head, Still Life and To Tame a Land on POM, and that's it).
Anyway, I'm not complaining - I actually think that Maiden manage to do that style very well. I was just curious what other people were thinking.