" is simply describing a PAST action. In the normal flow of narrative, simple past tense ("I did") is used for the primary foreground actions, like the plot of a story. Present perfect, on the other hand, is used when you are being descriptive (rather than telling a story) and as part of that description need to make reference to something in the past.
New words, one handy idiom, and a 2-minute quiz — delivered to your inbox to keep your streak alive.