I use a topsider as well if not for any other reason than piece of mind.
I have nightmares about having drained the oil under the car and somehow not putting the drain plug back on securely only to have the oil flowing out while I'm on the highway. Yikes!
I know it sounds mindless, I mean how hard could it be to thread a screw......but I think we all have our moments. If there is a way to prevent this from happening, why wouldn't you?