Johnston's impact was more comprehensive than individual accolades. He was pivotal to the Warriors' 1956 championship title, forming a formidable duo with Wilt Chamberlain. A six-time All-Star and five-time All-NBA selection, Johnston averaged a well-rounded 19.4 points, 11.5 rebounds, and 2.5 assists throughout his career.

His journey was challenging. A devastating knee injury forced him into early retirement after the 1958-59 season. Despite the premature end, Johnston's contributions were recognized with his induction into the Naismith Memorial Basketball Hall of Fame in 1990.