Two years same as cash?

I bought a piece of furniture last week and paid cash. It’s not that I have a lot of cash on hand, but when I want something, I save my money until I can pay cash for most items. A co-worker told me I should have used the two years same as cash feature because it was free interest. I disagree. If I have the money to pay in full, why have payments whether it’s interest free or not? Am I looking at this wrong? Should I use the same as cash feature when possible?