Phil Lamarr was my favorite MadTV breh because of his Michael Jackson skits

....now he gettin' that cartoon voice-over money
Alex Borstein got lucky as hell with Family Guy. No hate towards her and I'm glad she found success and all, but really a lot of voice actresses could do what she's doing now....
Nicole Sullivan had a nice long run on King of Queens.....
Mo Collins and Will Sasso be gettin' roles here and there

.....most notably she played a teacher on Ned's Declassified, and Sasso had that 3 Stooges movie...
I think Bobby Lee is still a somewhat-notable name nowadays as a comedian, although he hasn't done anything big since the show. Basically the same status as Aries now.
Other than those, you're right.....damn near everyone else fell off. And the only one who didn't deserve it was Debra Wilson, who was a more talented performer than damn near all the others....
Part of me wants to give props to Pat Kilbane and Michael McDonald as well....biut I think that's me reminiscing about how great their MadTV characters were rather than how great THEY were.....