My best memories as a reader would have to be from the old days too. There are a lot of stories I remember reading for the first time and being glued to my screen, but my favorite memories might be from the Swollen Issues era because that was one of the first stories I remember friends of mine, like Mare, reading at the same time, so we could discuss it. Nowadays with AC, that is a lot more common - like with Dodging the Daylight last year - but back then I didn't really have a place or a group of friends to talk fanfic with. I was absolutely addicted to Swollen Issues, especially as the second one was being written, and would go to the site and refresh it multiple times a day to see if they had updated. It was bittersweet to see it finally end.
Along the same lines, the story I miss writing the most would have to be By My Side. It was so much fun writing all that angsty drama and looking forward to reactions from readers. I think Broken Nick and Claire will always be my favorite characters to write about.