We did PP+ this past trip and really liked it. We won't use it every trip, but we were eating at Chef Mickey's, Tusker House, Akershus, 1900, etc. and between that, the ride photos, and the usual photopass pictures that we stop and get - it was well worth the price! I think if you're only going to do one meal and a few rides, it's probably not worth it.
We'll get it every few trips, but not each and every one. We're going to
Disneyland this year and I've read up on it - it doesn't seem like a good option there, but WDW has more bang for the buck.