Foot speed is not the be-all and end-all that some make it out to be. Obviously you need some fast players in your team for balance, but there have been plenty of great players that weren't that quick.
I agree with you on this. Some of the best players in the AFL are not all that fast but they have that ability to make space and dispose of the ball cleanly/accurately. Go back a few years and remember a guy called Keith Chessel. Played for Sturt. He wasn't fast but boy he always had plenty of time to get rid of the ball.