Love Taylor Swift or not, 'The Eras Tour' is astonishing.

Pro tip: If you're going to see "Taylor Swift: The Eras Tour," make sure you see it with a packed house of grade-school-aged girls primed to shriek, rush the screen, take selfies and make heart hands through this delirious, dizzying celebration of Swift-mania.

Sure, that's probably redundant. (Is there any other way to see "The Eras Tour" than with a…