That is actually very untrue. Read about Smith Wigglesworth. There have been many who called their families together told them of their pending departure, set their affairs in order and then left. We receive what we believe. Most people believe as you have stated and they receive it. Read
Heb 11:5-6 - Enoch had the testimony that he pleased God and was taken, and it is impossible to please God without faith. Therefore, Enoch must have had his faith set according to his testimony. We receive what we are willing to believe God for. Don't limit what God can do and has done for us.