Yeah, that's a tough call. Weekend I reports from the FTF PP (not Deluxe PP) dessert party area were that it was more crowded than expected, but Weekend II reports seemed to be better. I waffled for a bit, then factored in how much dessert we would actually enjoy (I am not a dessert dude at all, DD wouldn't eat much of it, etc.). I've walked in that party area before other events in the past and I remembered it being pretty loud--and this had to have been the same. Put it all together with still having to arrive early for the parade (60 minutes at least), a desire to see Baymax without an obscene wait, and of course the FTF cost itself and I realized it just didn't make sense for us. I'm sure it's great for many, but just not my family's particular bag.
That said, I bow to the experts here for their advice and opinion.