As a fan, you may enjoy the WWTBAM Star Wars editions. They are 100% SW trivia and a lot of fun. Those were at full capacity so a Fast Pass is best for that.
Really, the lines are around the autographs for the celebrities and inside and around Tatooine Traders. Not sure on what day you were planning to go to MGM, but the weekends start on Fridays and the crowd was not as bad as it was on Saturday, which was also an EE day. That had had two rather large crowds: one set running towards Star Tours, the other towards TOT and RNRC. The Star Wars events ended around 7 PM so they don't actually go all day long.
Another plus is the early morning parade. They have the celebrities and all Star Wars characters in it. It is short, but is still a really nice addition.