Code reuse, why copy/paste is the enemy!

I had to fix a loose railing on the deck, so I took out my trusty cordless drill/driver and a couple of screws, and presto, tested and fixed. The following week I had to fix a loose section of fence in my yard, so I took out the same gadget, along with longer screws that required a different driver bit. Now I could have went out and bought another drill/driver because I needed to use a different bit, but why do that when I had one that already works, all I needed to do was change the bit, right?