The Dutch goalkeeper, who retired from football last month, worked with Spurs boss Mourinho in his last season of football.
Vorm told Voetbal International: "Five or six years ago you couldn't have imagined that he would become a Tottenham coach.
"He has a certain way of working and playing and that takes time. Now you can see his style more clearly at Tottenham. Now you can start judging him a bit more. Mourinho really insists on winning a prize. I get along very well with him.
"Look, people also have a certain image of Louis van Gaal. I also worked very well with him with the Dutch national team. I also think Van Gaal is a nice man and I see similarities with Mourinho. Of course I had a certain image of him.
"But when you work with him, it is different. I like a clear way of communicating and Mourinho is very direct. Take it or leave it."
Vorm added: "That is one of the reasons that Mourinho is now there.
"In terms of football it may not be as spectacular as under Pochettino, but with him they hope to take the next step."