I've never uses stop loss, I could but I did not I don't know why. And I think it would not make any difference for me, I would still make loss but probably spend less time looking at the screen.
You can minimize your losses through stop loss, if you are gone from trading for long time and the price keep falling, you can use this to prevent losing more. Except you are a daily trader who always seeing the chart, it doesn't need to use stop loss.