Actually, in my experience, it also suggests an attitude of insouciance as well.
The last time I was accused of "walzing in the door," I was 15 years old and it was midnight. My mother had told me to be home at 11. I entered the house as if nothing were wrong, said "Hi, Mom. What are you doing up so late?" Her reply (only a part of which is printable here!) was, "Who do you think you are, young lady, walzing in at midnight? Didn't I tell you..."
I would add that the expression is usually used of someone who would have been expected to come creeping in shame-facedly -- think of a parent complaining about the hours their daughter is keepiing —> "she had been out all night, we were sick with worry, when she came waltzing in the door at 10:00 am!"