Since the beginning of our marriage, I have collected magnets for every trip we have ever taken. I even collect for the little day trips. My fridge is getting very full after 12 years. I will often stop & look at them & remember the great day we had at the zoo or museum so many years ago. So if we duplicate a place (like Disney) I often buy a magnet with the year.
One of our favorite family souvenirs are the Mickey shaped pancake ring, egg ring, and Mickey hand spatula. My DH making pancakes in the morning is a family ritual, so this always brings a bit of the magic back for us.
I will have to say my mickey and minnie christmas stuffed plush dolls with the full christmas outfits on. I just love them and hope to buy more this year.
Of all the things we have bought over the years I enjoy the Photopass pictures with the whole family in the picture. They also seem to use the right lenses (I only carry a 50mm normal lens) at the right time and are really able to make the backround of the pictures look just right. I also love the extra effects you can add. My favorite is a picture I have of my girls with his autograph across the picture. These are the best memories to me.