Just reinforcing some of the points made by AW......
The MCC became mandatory on 1 July 1999 when JAR was formally adopted by the UK CAA for multi crew flying. So anyone applying for their first multi crew rating required to complete a MCC course.
It gave you a basic introduction to multi crew operations from an environment of the single pilot flying.
It taught you to interphase with the other crew member, and operate effectively as a crew, PF and PM, and follow a simple set of SOPs, and manage the workload as a crew.
The majority of the flying is with the AP engaged, because that is how a crew will operate in the real world.
Its primary purpose of the MCC course was not to improve your IF skills per se, but to get the "two actors" on the stage to get the words of the play correct, and learn their precise roles as PF & PM, which through CRM is a critical aspect of any sim ride as part of the interview process.
Hand flying and coping with the power/pitch is important, and does need to be mastered prior to any sim ride. Boeing & Airbus are ideal sizes to appreciate jet inertia/momentum dynamics. A Kingair will not give you this experience.