I never got into them until literally just a couple months ago and now I have two!
I use them for quick errands or going to the gym where I all need to carry are cell, ID, gym card, debit card and keys.
I also put them inside my open top bags when I need to carry, ahem, feminine stuff. It's much more elegant in a wristlet than potentially exposed or spilled out uncovered (believe me, that's happened).