We are told that we will have glorified bodies like the one that Jesus had after His resurrection (Philippians 3:21). Once the disciples got over the shock of His resurrection, they easily recognized Jesus whenever He appeared to them (John 21:1-7). In like manner, the disciples recognized Moses and Elijah when they appeared at the transfiguration of Jesus (Matthew 17:1-5).
We do not become non-entities at death. We retain our individuality and personality. God constantly refers to Himself as "the God of Abraham, Isaac and Jacob" long after their deaths. His fellowship with them is obviously continuing in Heaven (Luke 20:37-38).