Once you hit the Georgia/Florida border....you're halfway there! 
Galaxy's Edge was busy when we went to DL back in October, but it wasn't horribly packed. I definitely wanted to call all the youtubers that hate Disney liars for calling it a ghost town though! We're already planning a trip there next fall (2021).
Halloween time and Christmas are the two busiest times of the year. Last summer it was completely dead. Actually right now, it is pretty dead too considering they just opened Rise of the Resistance. Disneyland is using the boarding group virtual queue. You have to get a boarding group as soon as the park opens at 8am from the DL App. Boarding groups disappear with ten seconds of Disneyland rope drop. You must be in the park at rope drop to get one.
What Disneyland is seeing is the place is packed at 8am as everyone plays the boarding group lottery on their phones. If they don't get a low enough number, thousands leave the park. By 9am the park is pretty deserted and very pleasant the rest of the day.
If you plan on going to Disneyland for the next few months (maybe all year) be prepared to be in the park at rope drop and ready to press the boarding group button on your phone. If not, pretend Rise of the Resistance doesn't exist and have a great day doing everything else.
