I don't think you'll see this ill effect. Rope drop is rope drop. Casual tourists that would rather come in at 10 or 11 are not going to be picking 9am slots, and power-tourers that want to rope drop at 9am are going to take midday slots and use the rope drop time standby. Thus, you have everyone pretty much wanting midday and early evening slots. If anything I think the longest standby lines will continue to be midday, and they might be longer than before, because so many ppl are going fastpass during this time. Getting there early to beat the crowds will still be just as useful as it always was.
Based on what you describe above, I think FP+ would work very well for you. You'll arrive early, ride quickly from 9-11, take FPs for 11, 12, and 1, and be out of there by 2.