I do not remember those although my time frame is probably a bit different.
I went as a child in 76, as a teen in 82, then I took my DH and 2 kids in 2005, 2006, and 2009.
I don't remember the coloured plastic cutlery but I do remember the black plastic mickey shaped plates that they served all the counter service kids meals. They had a main compartment and each ear was a smaller compartment.
We loved them and cleaned them out and between our 2005 and 2006 trips took 10 of them home. The kids still eat out of them and 7 of them are still in perfect shape. Cheapest set of kids dishes ever! When we went in 2009 they were gone with the cutbacks.