I can vouch for (90%) of this entire thread. Looks strangely familiar to something I've read before....
Edit: I just wanted to point out though, for your "fishing macro" that is highly incorrect. There was (at one point) something called "Rod Abuse" which allowed for massive spamming of fishing rods, practically allowing a single user to crash and/or lag a server (or the regions loaded for that specific player) to high hell.
Edit 2: Your statement on the "1 hit hack" is somewhat incorrect. I wouldn't account abuse of potions as a general 1 hit hack, but as an entire seperate, more general hack all together. Abuse of the strength potion (the aim of the video, now that Widd/Team Immersion) was the reason behind the fact he could kill people that way, and the same goes for the enchant hack. It exists, but there is no vanilla, non-creative way (through modding) that allowed for this top happen in multiplayer.