I'm not a mac user, so I have no idea what the folders are called...
If all your stuff is in your old folder, then copy it over. Saves, mods and CC should all be fine to copy over, so should "installed worlds". I'd do it all one at a time. There should also be a file called "option" in your old folder. If you copy that across, your game will run at it's old resolution.
Failing that, I always just set my resolution to the absolute max the game says I can have.