Thanks for quoting the specific verse, which was part of my scriptural reading last week. .
Since I have returned to the United States, and do live in the Bible Belt, I do routinely say “God Willing.” The traditional phrase is “God willing and the Creek don’t rise.” I learned recently, that while many of us think of the creek in terms of natural disasters, and floods, the original phrase actually refers to colonial times and Creek uprisings.
It still works when the concern is heavy rains and flooding, and the need to shore up against flooding. We do not have any idea what tommorrow brings.
I remember a story out of WWII when a Jewish man answered a Nazi saying he had no idea what the day would bring. Turned out to be true when the Nazi, a member of the Gestapo arrested him.
Although we may make plans, as the Scriptures says, it is the Lord who directs our feet. We do not even know what tomorrow will bring.
I also use the phrase “Have a Blessed Day” which is common here. When we trust in God, there is never any reason to fear.