According to the
common names search at IMDb,
John Ratzenberger and Joe Ranft both have voice parts in all seven movies. For three of them, however, he is just one of the credited "Additional Voices." His streak is now over, however, since he died last year in a car accident (there is a tribute to him during the credits of
Cars).
Andrew Stanton has voice credits in six of the seven movies, lacking
Monsters, Inc.