Originally Posted by LHR/MEL/Europe FF

There is a full meal service in the main cabin, so carts in the aisle to distribute meals and drinks, then carts in the aisle to collect after the meal.

Carts in the aisle of a narrow body restrict movement for a period of time, with the resulting surge in demand after. This leads to people waiting in the aisle at the back of the plane, shuffling around each other and the crew in the rear galley to get in and out of WCs.

You don’t get those issues in a wide body.