There are some auto import options to do what you are looking for. But you have to make sure first that your files are being imported as the proper types. If your movies are showing up as movies, then you're ready to start. If not, you need to force your movies to be imported with [Media Sub Type] of Movie first.
The options:
Tools > Options > Library & Folders > configure auto import > Tasks > Get Cover Art > (unchecked)
Tools > Options > Library & Folders > configure auto import > Tasks > Get movie and TV info > (checked)
Also, once your files (movies) are imported, you can easily highlight all of them, or large numbers of them and run "get movie and TV info" on the whole batch at once.
Do you have auto import set up on a master directory that contains all of your movies? You make it sound like it's a one by one process; it certainly doesn't need to be done one at a time.
About your cover art: If it is named the same as the movie file name, all you have to do is: <right click on movie> > Cover art > Quick find in file/cover art directory . Then MC will connect the cover art to the file. If not, you can do <right click> Cover art > Add from file and tell it the file name.
Good luck.
Brian.