Lundstram has returned to Finch Farm after helping Doncaster win the League One title.
He told evertonfc.com: "It's given me a lot more confidence. I've come back and I'm more of a man. I'm more experienced, it's made me quicker on the ball and make quicker decisions, so it has helped me all round.
"I've had an experience that some players never get in football. I'll cherish it for the rest of my life and I was very lucky to get a move like I did."