I was introduced to role playing games with AD&D 1e and weapon damage vs size was my baseline. Now that I'm playing and running clones for the most part, I appreciate the lack of a single die type regardless of monster size.
Still, I do remember the damage charts for a good 80% of the weapons from 1e. Many of them didn't make much sense to me (such as broadsword) but we didn't stress it back in the day. After all, it was canon ;)
Do you use weapon damage vs size these days?