I've learned
...the GLO world is a lot bigger than the NHPC, Professional and Service GLOs (what can I say, I went to an HBCU

)
...there are a lot of people who have a negative view of GLOs, but even more share my positive experiences.
...a hell of a lot more that I even knew I wanted to know about the NPC rush process. (and FWIW, I still can't keep it straight)
...sarcasm translates very well over the internet
...

causes a lot of unnecessary (but funny) drama, but GC wouldn't be the same without it.