Tip for keeping up with gift cards: I buy $25 gift cards from the Disney Gift Card website in unique designs and those are the cards I keep. I then buy the ones in the grocery of the same 2 or 3 designs that over 90% of the people at WDW carry and add those to the unique cards. When in the parks, I can pick out my card by sight. So far, I have not had a CM indicate they have seen that card before and most comment on how cute it is.
For example, I bought one with Tinker Bell featured for myself and I have used it to add various gift cards for four trips now. I got my sister one with Rapunzel that she has used for her last two trips. This way we knew which card was which at a glance.