We experienced our first Christmas at WDW last year and these are the things we loved:
Candlelight Procession at Epcot. it was wonderful. The music was beautiful and inspiring. They do offer a Dinner and Priority Seating for this event. Depending on who the narrator is, I would suggest getting it.
Osborne Lights at DHW - just amazing! Make sure you’re there early enough to see them light up. Being from Canada we had a good laugh at the “snow” - but it really thrilled a lot of people.
Gingerbread House at Grand Floridian. It’s so adorable - and treats and ornaments are sold. To make it very special arrange to take Afternoon Tea first. Then find a comfortable chair in the lobby and listen to the pianist play.
Visit all the resorts to see the different decorations.
Visit all the parks to enjoy the Christmas Trees.
Make sure to visit the Christmas Store and especially the German Pavillion in Epcot - to view all the gorgeous ornaments.
All the countries in the World Showcase at Epcot have special holiday features. Those that celebrate Christmas tell their traditions. Other countries, such as China and Morocco have the special customs of their countries.
We’ve never done MVMCP so I can’t advise - but I’m sure it’s special.
Christmas is very magical at WDW. Don’t worry so much about all the rides and attractions. Slow down and take in the magic of Christmas.