I can tell you what we observed, which is different from being able to reach a conclusion. What we witnessed was a whole new way of merging the SB and FP lines. The number of FP people let in to rides that have always had FPs was far greater than ever before. Often times, the CM would hold up the SB line for 10-15 solid minutes while FP people streamed in. Logic tells me that this has to make the SB line take longer than before, but I cannot tell you if what we witnessed was a few clueless CMs or a whole changeover in the way things are being done.
As for rides that didn't used to have FP at all (like PoTC), the very fact that there is half of the queue dedicated to FP people means that the SB line is longer in length and longer in time. For example, let's say that in the stretch of an hour, 2,000 people want to ride that ride. You were the 1500th person to get in line that hour. The only people who were in front of you were #s 1-1499. Now, with a FP line at that ride, let's say that #s 1-1299 get in front of you in the SB line. No change there. And #s 1300-1499 are now in the FP line. They were ahead of you before and are ahead of you now. Still no change. But now let's take #s 1501-1599 who used to be behind you and shift them over into the FP line. They now get ahead of you. So you are now the 1600th person to board as opposed to the 1500th person to board. The same number of people will board in an hour, but the FP system takes all of the people who used to be in front of you and keeps them in front of you, and takes a certain number of people who used to be behind you and places them in front of you. Obviously, if you are #2000, then nothing changes, because there were 1999 people ahead of you to start and there remain 1999 ahead of you. They have simply shuffled their order. But if you are not at the very end, then the FP system (old or new) will move people who used to be behind you and place them in front of you. There is nothing to be done about this. You either buy into the system or you hate the system and FP- or FP+ has nothing to do with it.