Like everyone here I was tired of not being able to skip the intro movie and being forced to watched that ■■■■ everytime. There is no build-in option to turn it off (because why would they even think to add that). But rejoice! Here is a simple quick fix to go to the main menu right after launching:
Simply DELETE or MOVE the intro movie .mp4 file(s) from the Movies folder where your AoE2 DE resources/content directory is.