We are not long back and have to say the stand-by queues were pretty horrendous in the middle of the day.
No idea how much the new FP+ system will affect things next summer though but can only recommend that you get to the park before rope drop and fast-pass as much as you can - we managed to do everything we wanted no bother- also BTMRR and Splash were walk-ons later in the evenings.
We stayed at a Universal resort for 1 night for their front of the line passes and bought easy queue at BG (both well worth the money if you can manage it)