Oh, I watched just about everything on Nick as a kid!
I watched SNICK religiously- remember the original line-up? Clarissa, Roundhouse, Are You Afraid of the Dark?, and Ren and Stimpy (although I did not like Ren and Stimpy much). I loved Clarissa and Roundhouse! I can still sing the themes.
I caught Are You Afraid of the Dark on tv the other day and was so excited to see it again!
I watched Nick Jr: The Elephant Show, Maya the Bee, The Little Bits, David the Gnome, Fred Penner's Place, Eureeka's Castle, The Little Koala, Grimn's Fairy Tales, Noozles
I watched Doug and Rugrats- the other original Nicktoons besides Ren and Stimpy which I actually did watch at first despite being grossed out by it. I remember when they first premiered.
I watched game shows like Double Dare, Think Fast, Nick Arcade...I was *on* Wild and Crazy Kids- well, sort of. They did a boys camp vs girls camp episode, and my camp was the girls camp. I chose not to participate in the games, but on the episode, you can see me in the audience of the relay race game.
I used to not like You Can't do That on Television, but in the later years that they aired it, I changed my mind. Kids today don't even know where the whole slime bit came from!
I watched Hey Dude all the time. I watched Alex Mack, Salute Your Shorts, Welcome Freshman, All That...bunches of stuff!