Photopass is great. When we first heard of it I thought "just another way for Disney to make money" which it is but you can get some great pictures in spectacular places and they can do interesting things with the pictures. If a photographer stops you to take you picture they will give you a card you just carry around with you the rest of your stay. There is no charge to view the pictures online (i think you only have 30 days) only to purchase.
I would reccomend trying it out.