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I saw the one he did sorting mobs by preferences, it was actually pretty funny. Don't remember if it was him or someone else that set up a sorter to get creepers shot by skeletons for records.
I'm at the point where I either build my own packs, or use trimmed down ones. I might throw in a Kitchen Sink pack, but then I go at it with pruning shears before I play it.
I'd say Thermal Suite and Forestry are two better contenders for second to learn. Thermal has a big team behind it and Forestry's got a team and devs who've been doing this long enough that they're almost always among the first to hit release.