We did the Trek last weekend and it was FANTASTIC! We were able to get an AP discount which took the price down to good. That initial price is a huge shock to the system.

But there are several little things included in the price per person in addition to the actual experience. You will get photos that are taken by the guides that are free to download, print, share etc for 3 months after your trek. You will get an incredible lunch at a beautiful location where you can observe elephants and flamingos as well as the savannah. The food is delicious and well presented. And I believe many of the items they serve are exclusive to the Trek.
You will get water bottles with the Wild Africa Trek logo on them and a portion of your payment goes to the Disney Conservation Fund toward the area of your choice...ie, Big Cats, Elephants, Crocodiles etc. If you do not designate one, then the portion goes to any or many areas of the Conservation fund.

This is the 20th year of the fund so we got a really neat 20th anniversary button too.
The memories and the knowledge that you will attain are priceless...but the little extras are just icing on the cake. Have a wonderful tour!