Carrie,
Yes, at Epcot there is a card member-only Character greeting area for people who are Chase Disney Card cardholders.
If you go through your online banking system you can find the Disney page that lists these
benefits. The one you are specifically mentioning is held daily from 1:30 pm to 4:30 pm at Innoventions West. You must have your card with you, and you can bring up to a maximum of 6 people with you. You can even get a complimentary 5" x 7" photo with a character!
Now the characters vary, and there is no online listing of whom it will be on any given day, but you can expect many of the traditional 'suspects'. This is definitely a nice perk to having the card, if you are in the area to take advantage of it.
A quick hint is that you try to arrive right at 1:30 pm. This perk can get some decent lines rather unexpectedly.
Have a magical vacation!