I basically never wear heels since they're just not comfortable and I walk a lot and fast. So yes, comfy shoes for me!
My choices are usually ballerinas for summer and combat boots or some flat warm boots for winter. I haven't figured out a good option for when it's a bit too cold to wear the ballerinas anymore but the combat boots are a bit too heavy, but for those occasions I just buy something cheap which will fall apart soon anyway. I'm on the lookout for a more permanent solution.