Daily, though not excessively. It's saved my day on several occasions, especially when I'm leaving somewhere that's not my home. I may have taken my knife out to play with it at my desk at work, or in the lab, or even at someone else's house, in the kitchen. After a couple losses, there are some things that just make sense.
Another thing I don't ever do anymore. I will not carry a knife loose in pants pockets, that are not jeans. I even hesitate to carry one clipped to a pair of thin slacks.
Past mistakes make indelible marks on our psyche, and lead to preventative compulsive habits. Thank God for that. Just wish it didn't require the losses I've had...