Hmm, the "is it worth it" questions are tough ones. I purchased PP+ for our trip over Thanksgiving weekend because it was our first time visiting during the holidays and I was hoping to get some good family photos. This was the first time I have ever purchased it and, for us, I don't think it was worth it. Each time we had our photo taken I also asked the photo pass photographer to take one with our camera and those ones turned out just as good, and a few even better, than the photo pass ones. We got a few cute photo pass ones with magic shots and cute poses, but we didn't take the time to meet very many characters and we didn't do any character meals. Also, DS6 was not very cooperative when it came to pictures so sometimes it was a complete bust!
For ride photos, be sure to link the number of your photo to your photo pass. Some rides had kiosks right when you came out so you could do that, but some did not.