Should you engage a "Wedding Planner" to coordinate your wedding

My advice to couples is to think very carefully before they commit themselves to a wedding planner.
I am aware that many young couples are "time poor" because of heavy work commitments and that they believe that they might have much to gain by passing over as much as possible to an experienced and capable planner. 
However, I have usually found that it is very unwise for them to allow the planner to come between them and the celebrant.
I can see the argument in favour of engaging a planner to look after material matters such as cakes, flowers, reception services, transport and the like.  However, the wedding celebrant is such a personal aspect of the wedding that it is very important for the couple to be as directly involved with the celebrant as possible.  My experience shows that any attempt to have a planner dealing with the celebrant can lead to disaster.  Only direct engagement between the couple and the celebrant can ensure that the numerous sensitive issues involved can be dealt with effectively.  I have seen bad mistakes made by planners with regard to lodging of legal documents, sighting of identity paperwork, accuracy of information on marriage certificates, management of the nature and tone of the wedding ceremony and questions relating the the complexities of relationships with the families of the couple.
My strong advice is that if a wedding planner is involved in a wedding, then they might well have some good advice regarding who could be a suitable celebrant, but once the celebrant is chosen, the planner should stay right out of the picture and encourage the couple to deal directly with the celebrant in all matters that relate to his services for the couple.  One of the celebrant's roles is to ensure that their wedding ceremony occurs without worry or stress.  More often than not, the services of a planner lead to unexpected stresses that could be avoided if they stayed right out of the relationship between the celebrant and the couple.