I can kind of relate, I mean our plans have Epcot listed for Saturday and now I'm second guessing things .... I did put AK down for Christmas Day, as I think it will most likely be the least crowded. I had originally also thought about Yak and Yeti, but ... being Christmas dinner, (and if they close pretty early), I'm seriously considering going to Disney Springs and trying the Boathouse, followed by hot fudge sundaes at Ghiradellis.... I love Yak and Yeti but thinking that might be a better plan.
Why was or is it hard to switch plans? Do you mean because of dining reservation? I'm afraid to switch anything for fear of cancelling the one day and then finding the other park I wanted just filled out, that would be bad!