Last campaign I played was Diaspora, but I didn't finish it yet. I wish I did, but RL takes out a lot of time. When I'm not in school, I'm working for my organization or looking for an internship. When I'm not doing that, I'm working for my job.
Retail is still a very awesome campaign, and I do plan on going back to it again because I never beat it on Insane. Last campaign I played before Diaspora was BP2 when Delenda Est was impossible. That mission discouraged me a bit from FreeSpace because I felt like I lost all my skills in space sims and gaming in general (it turned out to be bugged, fortunately). I played BtA from time to time, and I probably played WoD before replaying BP2. And before that is retail.
Retail is fun, especially since I have a goal set for me. Multi is a ride when there are people to play with (haven't had time since last year). I tried to upgrade several campaigns including Sync, Transcend, and Windmills. There should be a thread under the Campaign Restoration Project. They're not the best restorations, but I tried to make Windmills functional for 3.6.12. I didn't get enough feedback to consider looking back at those and fixing anything, so if there's something that's broken, let me know!.
The best part about HLP is not the mods, though. For me, it's the community. Whether it be IRC or Gen Disc. (which seems have its ups and downs [downs lately]), HLP has lots of smart people that I like listening to, even if I don't understand all of it. Mostly because y'all make it understandable to the average person, and your interests are interesting to read about.
EDIT: One thing HLP has done is broaden my view. I started reading what people are saying and understanding them better than I should. Whether it be political, religious, scientific, or women's issues, I feel that HLP has been a major influence in my thinking of the world. Also, this broadening of views applies to reading threads too.
For example, that Spoon and MinMixael vs Karajorma thread: I knew that there was a misunderstanding. I wanted to say, "Hey guys. Nobody's suggesting that every needs to learn how to script and that scripting is better," but I didn't have the guts to post because lots of prominent members were there and the argument seemed to be personal. Looking back, I should've said something.