If you have a large cutting table available, it can double as a layering station when you go to baste the backing, batting and top together in preparation for quilting. It's also helpful to have a large table when you go to trim the quilt when it's ready for binding. This saves you from having to perform either one of these steps on the floor, which can be hard on your back.
A large ironing surface is helpful when pressing an entire quilt top before layering. It's also great when ironing yardage after prewashing. Unless you're into miniature quilts or dedicated to small wall hangings or table runners, bigger really is better!