We got a FP for Haunted Mansion in November because:
- We're going Thanksgiving week
- We have 2 MK days, so 6 total FPs to use in the park
- We're not ones that have to ride something multiple times on a trip
- We're going to be in Liberty Square right in the middle of the day.
At the time of day we will be in the area (12:00-2:00), given the other conditions, I would expect HM to be a 30-45 minute wait. So, yes, there can be value in a getting a FP for HM. Since we're going to be in MK for 2 days, could we have secured a 2nd FP for Mine Train, Space, or Big Thunder? Sure, we could have. But, we decided that since Thanksgiving week is going to be busier than what we normally experience, we looked to save time where we could without duplicating rides. If the opportunity presents itself at the end of the night to grab a last minute 2nd ride on Big Thunder, we'll take it, but by saving time earlier in the day by using a FP at an attraction that will have an above normal line, we think it helps our overall touring strategy.