I love BronyCon for the myriad possibilities. I found more of my tribe, and had a blast participating in random convention memes. I love being able to chill with people with that same interests, as well as take in all the cosplays, the panel programming, and being able to shop around in the marketplace.
I value it most for being a motivator for me; this is my reward to myself every year. I work toward this (relatively) easy goal and pretty much get 100% of the time.
The friends I made have to be the best part- I only really get to seem them once a year, so during that weekend, we are able to hang out and catch up. All the while, we roam the convention space.