My list:
Six Flags Marine World - 9 times... in the past 3 months
Paramount's Great America - Once... a year... atleast
Knott's Berry Farm - 2 times, But i rode Xcelerator on opening day in the 3rd train of the GP(so it's a win win situation)
Disneyland - 5 times
Disney's California Adventure - 1 time
Six Flags Magic Mountain - 1 time(and i hope never again)
Santa Cruz Beach Boardwalk - 2 times
Sad thing is, some of you have been to way more parks in the US then me and i LIVE in the US.