We have always had good luck with PotC, IaSW, and HM- never needed FP for them and never had to wait more than 20 minutes. We do go during lower crowd level times.
The only attractions we routinely get FP for are:
MK- Peter Pan, Space, Splash, BTMRR
EP- M:S, TT, Soarin’
HS- TSMM, RnRC
AK- E:E, KS
Adding- we haven’t been to WDW in about 4 years, so I’m sure there are newer attractions that require FPs.