The best scenes in movies are often the toughest. That chase or epic fight sequence or sex scene probably looks so interesting and layered and just plain cool because it was a massive pain in the ass to shoot, for the filmmakers and for the actors.
Seriously, you think Tom Hardy was pumped about being staked to the front of that muscle car with a metal mask on his face for days in Mad Max: Fury Road? Or that Leonardo DiCaprio, a vegetarian, was all down with eating raw bison liver in The Revenant? Or that poor Shelley Duvall had to play hysterically in danger of being brutally murdered by Jack Nicholson for 127 takes in The Shining?