My preference is that you will use AAA sparingly throughout the season and mainly use players that appeared on your HOF ballot. There are some ballots that are extremely thin at positions and the use of AAA players will fill in the gap. It doesn't matter to me what year or who you manually draft.
For example, I'm looking at 2007 for a second team and Dale Murphy is the only player on that ballot that qualifies at catcher so I would draft a backup catcher with one of my AAA slots.
Good_beef sitemailed me and he has no 2B outside of 1987 George Bell playing out of position, so he would likely need to draft a couple 2B's to fill out his roster.