Fear not.
DW and I were there last year during the same week and found the crowds very moderate. Wait times for attractions were very minimal, even less so w/ FASTPASS.
In fact, we chose the same week again this year for our family trip with my parents and my grandmother (85 years young and her 1st trip to WDW).
MGM may be a little more crowded on the FRI/SAT/SUN due to Star Wars Weekends, but last year it still was not too congested.
Plus if the boys like Star Wars, they will never forgive you for missing it.
Enjoy your trip.