I can’t even begin to explain my love of a good tray. They serve a million different functions. We use vintage bamboo trays when we are having BBQs so our guests can hold all their refreshments. I use them to help corral toys around our house - they are especially helpful when playing with play-doh or coloring and we are going between the kitchen and the playroom. I also keep one at my front door so I can throw all my junk in it during the week and then take it around the house with me at the end of the week and put all the items where they belong.
But the best use for a tray, in my opinion, is to help draw the eye to a collection. Just like an area rug helps pull the room together, a well placed tray will help pull the decor of your table together.