Before you add an item to your to-do list, make sure it isn’t already there—hidden under different language. The same goes for responsibilities you’re doling out. Ask your coworkers to determine if a new task or idea overlaps with other assignments, so that their to-do lists don’t get bloated also.
As a leader, you need to be judicious about what you add to your plate. Make sure new tasks or ideas are truly new and distinct (and under your jurisdiction) before putting them on your to-do list.