If you'd like a flashback to McDonald's of the 80's & 90's, check this article on DrivePedia. Looking back, it's surprising how many little things have changed but when thinking about it, all of those little things help explain why a trip to McDonald's today feel so sterile versus a trip back then.
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The huge amount of styrofoam containers were indeed bad for the environment but I'll go with the unpopular opinion that the McD's breakfasts tasted better in them versus the plastic containers now used.

40 Photos of McDonald’s That Show How Things Have Changed
Remember when you would beg your mom or dad to go to McDonald's? It always seemed like a treat. Things have changed so much now. How much? Take a look!

The huge amount of styrofoam containers were indeed bad for the environment but I'll go with the unpopular opinion that the McD's breakfasts tasted better in them versus the plastic containers now used.