I am grateful for my sense of smell because it means the scent of a nice dinner spreading through the house increases the anticipation for it.
Sometimes smell evokes memories. When I was in middle school, we would walk or bike past a huge cabbage field. Every autumn, after the harvest, the smell of over-ripe cabbage leftovers from the field would spread up to the bike path. I still remember that walk every time I smell cabbage. Of course, now, the cabbage field has been expropriated by the municipality, and there are houses being built.
Not a huge fan of that.