I love when we revisit old zones, and BfA has had some of that–revamping Darkshore and Arathi as world quest/warfront zones is cool, and I like doing the heritage armor quest chains which have you revisit old areas (delving into the bowels of Ironforge to visit an ancient king’s study was cool!).
And now we have Uldum and the Vale being invaded by N’zoth… not that I was exactly chomping at the bit to see what was happening in Uldum, but still, it makes the world feel alive in a way that removing portals certainly doesn’t.