In the sixty years I knew the man, I never heard my father say "thank you" to anyone. He wasn't an ingrate or boor. He had a more heartfelt way of expressing thanks. He always said "much obliged". It really implies a sense of obligation for a kindness done by another.
Perhaps Dad overused the expression, but I was always impressed. Several years ago, I asked a British friend if he ever heard the term there. He had heard it, but it was rare these days.
Have you ever heard "much obliged"? Does it seem quaint or excessive to you?