We have had the same PVP/CVP for over 20 years and she has done a great job for us. Has there been a mistake once in a while, sure, but when contacted she quickly corrects it. In talking with her this week, which took longer than normal for her return call, she apologized that they are extremely busy since it appears they have lost a number of planners, thus the long wait.
As an added note, be aware that if a cruise was originally booked for a third or fourth person with a Princess Plus Package, and you request to re-fare due to price decreases, the system automatically takes off the Plus Package from the extra passengers. You need to request that they be put back on. The only way to note this is looking at your trip summary page. It's easy for a planner to forget to note it when they are very busy.