Some rides require double taps, so if there’s a line, you’re stuck waiting for that second tap. For example, on Toy Story Mania, the second tap point is right before you get on the ride, so if there’s a line, you’re still waiting, which kind of defeats the purpose of a burner. Get a ride that you know is a walk on, Journey to Imagination would be one.
I'm definitely not a fan of wasting an LL just to throw it away—that's idiotic. Just enjoy the ride. That's the kind of stuff that ruins the slight hack for everyone.