Ruddy spent five years at Goodison after being plucked from Cambridge United by Moyes in 2005.
But the 26-year-old had just 80 minutes of top-flight action for the Toffees during that time - largely due to the form of Tim Howard.
Ruddy made NINE loan moves during his Everton stay before joining Norwich full-time in July 2010.
Moyes said: "I'm a little surprised at how he has developed.
"It was always going to be difficult for him to get games in front of Tim Howard. But he's done great. You rarely put young keepers in the team and when he went to Norwich it looked like a chance for him. He hasn't half take it.
"He's really done very well."