I agree with you on some of these shows, but not Camp Lazlo or Chowder. Camp Lazlo was one of the better shows (in my opinion) when Cartoon Network was not doing too well. You may not like it, but the same guy that made Camp Lazlo also made one of the classic 90's Nick shows Rocko's Modern Life. And Chowder was my favorite show on CN back when it aired on Cartoon Network (and still is a good memory for me). I agree that a lot of the stuff they do in both shows are quite stupid, but Courage the Cowardly Dog and Ed, Edd, and Eddy also had that too, and it didn't ruin them.
I haven't watched Cartoon Network since 2009 after Total Drama's second season (which ruined Total Drama) ended. I even missed out on the four popular shows that premiered after (Adventure Time, Regular Show, Gumball, and Steven Universe).