Welcome to my wheel house.
Knew most of those.
Of note... the Yellow M&M was originally John Goodman. Billy West, who is credited as Doug Funnie and Fry in that article is also the Red M&M, had a long stint as the Bee in the Honey Nut Cheerios commercials.. AND is both REN AND STIMPY... his list of credits is longer than John Holmes'.. uhh... yeah.. you get it. He's done nearly as much stuff as Tara Strong!
Adam West... has greatly extended his career as a voice actor and has done countless roles in countless cartoons... usually as the fumbling superhero... and occasionally a local politician.
And not mentioned on the list... Ernest Borgnine and Tim Conway have recurring roles on Spongebob as Mermaid Man and Barnacle boy. Also of note... Marion Ross, Mrs. C from Happy Days, is Spongebob's grandma. Bill Fagerbakke, also know as Patrick Star... Dauber on Coach!
I have to stop now or this wall of text will rival that of China... I literally could go on forever on this topic.