Sorry to bump this old thread, but I joined just so I could post my memories of Nick Studios in '93 when I was 7 (during my first ever trip to WDWR).
First of all, let me say I did a DWR stay in 2009 (my most recent one) and we spent a day doing Universal Orlando as well. I had been to UO 3 times from '93-2000 and I was looking to relive some of the amazing times - but I was pretty disappointed. USO was an absolutely top-notch experience for me every time in the 90's but by 2009 I found most of the classic attractions were gone, the park was filthy and empty, people were pushing us to do surveys, employees were rude and detracted from the experience, and many guests were belligerent (but I guess that's almost everywhere nowadays). I never got a chance to ride Kongfrontation again and was lucky to be able to ride Jaws again before its removal (if they get rid of E.T. I will just cry..). But most depressingly, Nick Studios and its amazing, iconic fountain of slime was gone - in favor of Blue Man Group...and the only remnants of Nick's presence in the park were a store and some Jimmy Neutron attraction, which was basically already an outdated fad in 2009.
Back to Universal 1993. My dad took me on the Nick Studios tour and I was so ecstatic - to a kid who watched only Nickelodeon, it was pretty much a mecca. After every show filmed there in those days, they would play a clip of the slime fountain with a notation that the show had been filmed at Nick Studios in Universal Studios, Orlando, Florida. So to actually be there was really something special. The studio building was colorfully decorated and the tour guide and other employees were very animated. I vividly remember being shown the place where they "make the slime", and we were told what the slime was made out of, which was basically dye, powdered sugar, and water. We were allowed to taste some in small cups and it was a sweet, bubblegummy flavor. The show that was filming at the time was Clarissa Explains It All, which was amazing as it was my favorite show. From a hallway, we were able to look through huge windows down at the production of the show. I had the biggest smile on my face seeing the actors and the sets, it really did feel like a dream come true, which isn't a feeling most experience too many times throughout their lives. At the end of the tour, we watched an audience participation show which was pretty amusing and very Nickelodeon-esque. I remember feeling vaguely disappointed that we weren't able to be in the audience of a show like Double Dare or What Would You Do?, but it overall it was a very memorable and magical day, especially for me at that time in my life. I'm very glad I got to experience USO and NS at their peak.