I mean, the first 'Back to the Future' is kind of a perfect script, I think, in terms of handling time travel the best. It depends on your definition. To me, that means it effectively uses it in the story.
“Who's paying the million bucks? The insurance company. We've been trying for years to get the insurance industry to say to the gun industry, We won't insure you unless you have policies that will reduce the likelihood of guns falling into the wrong hands easily.”