Avengers: Endgame (spoiler-free, I promise)

My first impression upon seeing Avengers: Endgame was, “That movie must have cost SO SO much!”  But whatever it cost was worth it, especially judging from the gasps, cheers, and tears of the opening night audience.  The film is set on a grand scale, with not only the fate of Earth’s Mightiest Heroes in the balance, but those many, many dollars it took t…