No, I would not buy express pass ahead of time for that time of year. Instead, I'd decide when in the park.
On our last trip, this past Nov/Dec, we had express pass for half of our trip due to doing a split stay with half on-site at RPR. We barely used our express pass that was included. And then it was mainly just to get a shorter walk. On the Sat, crowds picked up a little, but it meant saving 10 minutes here and there, so still not a lot. The crowd calendars had our days at 4-5, with the Sat being a 6 I think. Even Minions was a walk-on at 9:30am on a Sunday - we didn't have express pass that day. (I think it got up to 30 minutes later in the day. I had read about crowds and lines at Minions and was surprised we had zero issues).