I watched the Benny Hill show when it originally aired back in the early 70's! I can certainly agree with you on how late night comics have replaced those older comedy shows.
Besides BH however you also saw other offbeat comedy shows back then many now wouldn't even heard about like Rowan & Martin's Laugh-in. Someone posted a YouTube clip on that one. YouTube - Rowan & Martin's Laugh-In Clip #6 Goldie explains it all.