Is aspartame commonly used in products that aren't labeled as containing it, or that one might be surprised about? I never buy any food or drink labeled "sugar

Is aspartame commonly used in products that aren't labeled as containing it, or that one might be surprised about? I never buy any food or drink labeled "sugar free" or "contains NutraSweet (or similar)". So I had assumed I wasn't consuming chemical sweeteners. Is it as common as you say because it is widely used in little-known places, or just because most people eat/drink sugar-free products? Asking out of idle curiosity/surprise. I'm not afraid of aspartame, I just don't care for the taste much.