Are you trying to sit down for Breakfast? Garden Grill might be a great option for you if you're rope dropping World Celebration. You can knock out Soarin', Living with The Land, Seas with Nemo, Spaceship Earth, any other interesting World Celebration attractions in the morning while you're in the area, then spend the afternoon and rest of your day in World Showcase.
Are you just trying to grab something and go? Honestly, I would grab a donut and a coffee just to fuel me through the rope drop madness from the Joffrey's cart outside of the Epcot main entrance. IMO Epcot has the best assortment of savory, lunch/dinner-forward options throughout World Showcase, so in the morning I just like to grab something quick-- either from Joffrey's or Les Halles if you're entering from International Gateway-- to keep me from getting hangry until the lunch options start opening up.