Hmmm. Don't think we'll do the Express thing. We're planning on being in these parks on Tuesday, Nov. 16th & Wednesday Nov. 17th. We're planning our vacation for the week before the Thanksgiving rush so I'm hoping the parks won't be overly-crowded.
You can always get it when you get there if you need it. I will warn you that once you have had Express Pass, it's hard to go back to standing in line.
Don't think it's worth it for only 1 time on the ride. We went the same time of year in 2005 and bought the passes but didn't use them at all. There just weren't any lines.
The only thing that gives me pause is Harry Potter and from what I've read, it may not even be offered as Express unless you stay at one of their hotels.
We loved the FOTL passes in CA but we went during the summer so it was well worth the extra money.