I loved Johnny Carson and Ed McMahon and watched quite a bit of David Letterman and Paul Schafer, once upon a time.
I like Jimmy Kimmel, think he's paid his dues, and Jimmy Fallon seems to hold promise.
The last few years I don't find myself watching any of them very much.
Too much competition from TCM, Discovery, History, AETN and the fact that I usually fall asleep early and wake up really early.
I still like the sidekick format and enjoy a good duo performance when one plays straight man to feed the other such as; Bud Abbott & Lou Costello, Jackie Gleason & Art Carney, George Burns & Gracie Allen, Dean Martin & Jerry Lewis, Dan Rowan & Dick Martin, Tom & Dick Smothers, Mel Brooks & Harvey Korman, Dan Aykroyd & John Belushi, Gene Wilder & Richard Pryor and even Cheech & Chong, to name a few of the older crew.
I'll take a bit of Groucho Marx, W.C. Fields, Henny Youngman or Don Rickles on occasions for some classic bits.
Charlie Chaplin, Harold Lloyd, Keystone Cops, Marx Brothers and the Three Stooges performed sight gags & slapstick to perfection.
Laughter is the best medicine.
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Never will be able to name everyone, yet my partial list of comedians is remiss w/o my main man, Rodney Dangerfield...