Too many times to count! We went several times as a kid, then I participated in the College Board program and work at Epcot for a semester. After that, I stayed in Orlando and went all the time. Now, living in Texas, we have gone once or twice each year since 1993.
I hope he hasn't changed to much, I know Uncle Epcot has changed quite a bit but that seems it so I am excited for my next visit this year.