Abyssea worm parties obsoleted leech parties and colibri parties, although the leech parties in the Oubliette are still the best way to level an adventuring fellow and to skill up. I had a lot of fun on WAR down in the sewers doing big Fell Cleaves on a batch of 9-10 leeches at once. Good times. But the Abyssea worm parties could reach upwards of 300K/exp an hour at their peak. That's how I got all jobs to 99 before Adoulin was released.

They also added in save point to save point teleports. Super handy. And warp scrolls are dirt cheap, as well as the multi-use warp rings.