I've got dual sided platform/SPD pedals. It turns out I almost never ride them not clipped in, but they are there just in case.

Once you get used to clipping in, it is hard to ride without doing it. It's like riding a bike without actually holding on to the handlebars. It just feels kind of scary.

(I leave work shoes at work, so it really doesn't matter what I show up to work wearing on my feet).