I grew up going to Disneyland, but USF holds a very special place in my heart.
Like some others have said, I feel more nostalgic for IOA than the Studios. The first time I went to the Studios the main rides were Jaws, Ghostbusters, ET, Kongfrontation, Alfred Hitchcock, Earthquake, Hanna Barbara, and Fievel's play area. We went a few times when I was younger (the last time being somwhere in the early to mid 90's before Murder She Wrote closed) and I did not get to return again until 2005. Therefore, a lot of the attractions that I loved as a kid were gone (all that remained was ET, Fievel, and BTTF)>
My 2005 trip was just post turning 21 and my best friend and I went down and spent a crazy long weekend running through as many Orlando parks as we could. We spent the most time at Universal (especially IOA) so I have very fond memories of that time. I am mostly nostalgic about it because my best friend passed away in a car accident about 4 years later, so the memories of that trip and our time at the park is really important.
I know that is a long winded answer just to say, "Yes it is nostalgic" but I thought it needed some explanation. Also, my wife and I do try to head down to Uni every year for HHN, so I have been back many times since 2005.