I use it when wearing padded shorts, but I really shouldn't need to wear padded shorts. I may need to get different underwear, so the fabric doesn't bunch up or crease, but that's about it.
When I was riding with a Brooks C15, I pretty much had to wear padded shorts or it felt like I was sitting on a wooden plank. I endured it for thousands of KM until I realized that there are so many better options out there.