A quiet preference still deserves space in a shared decision.

Groups tend to hear volume rather than strength of feeling. Someone can care a great deal and say it once, softly, while a mild opinion stated three times ends up shaping the plan, and afterwards everyone believes there was agreement. Quietness is not the same as indifference. It often just means the person dislikes competing for the floor.

When a decision is being made around you, ask the people who have not spoken what they would prefer, and wait for the answer. If you are the quiet one, say your preference plainly once and then say that you mean it.