I just returned from a trip to WDW, and here is my anecdotal and biased review:
1. Staying at the Polynesian with both morning and evening EMH, G+ was completely worthless. We bought it two days (MK park-hopping to Epcot and DHS park-hopping to MK), and we were able to do everything we wanted without it. We often ended up doing our G+ selections twice, the second time just to use the selections we had made. For context, our longest wait of the trip was our third ride on Space Mountain - 35:54, on a posted wait of 25 minutes. We did skip several things that are must-dos for others because we've done them so many times before - most notably Peter Pan, Navi (I'll never understand this one), and MF:SR.
2. ILL was totally worth it. We were able to rope-drop much of AK because we paid for FoP. Paying for Guardians and Tron also worked out great; the virtual queue for Tron in particular looked awful.
3. For context, it was a six night stay with one afternoon at DS and destination dinners most evenings. (Side note: though not signature dining, we were not disappointed in Steakhouse 71, even though it was sandwiched between stellar meals at Citricos and Jiko.)