An aisle is a small row between two sets of seats, so a dream that you are walking down an aisle can mean that you are trying to appease two groups of people, or two individuals, who have conflicting opinions about a subject.
If you dream that you are walking down an aisle while looking straight ahead, it can mean that others have not been able to distract your from your goal.
A dream that you watch someone else walk down an aisle can mean that are envious of the opportunities that they have.
If you dream that you are in an aisle but cannot move because there are too many people behind you and in front of you, this can mean that you feel that others are preventing you from making your own decisions.
Walking down an aisle is often a symbol of a wedding.