There is debate about whether the Good Morning Fantasyland breakfast is still running but even if it is you cant use it if you are staying at DCR.
However the breakfast at DCR is excellent. You collect it from a little hut and take it back to your cabin- so no fighting with the crowds. For 4 of us we were given: 8 croissants, one and half baguettes, selection of jam, honey, nutella, cheese, butter, orange juice, milk, tea,coffee, chocolate. More than enough.
Also if you are at DCR you will be entitled to EMH to get in early so no need for GMF