LotR (Jackson), Conan (Arnold), Pirates (especially movie 1), Big Trouble (gotta love Jack Burton), and Honor Among Thieves. These are all classic D&D style adventures. Each has a classic big-bad (Sauron, Falsa Dum, Barbossa, and Sofina). Each had great protagonists (Frodo, Conan, Sparrow, Jack, and Edgin). And four out of the five had great world building.
It is interesting to me that the favorites in the poll are the most grounded, and often, non-fantastical. (I know Pirates gets fantastical later, but that first movie simply had a few fantastical elements - which is why everyone likes it best.)