It's hard to explain; I didn't grow up during that era. I just think it has a certain charm and 'innocence' that the other shows haven't been able to capture.
Anyway, that's me.
I know what you mean. There's a misconception that whatever you're exposed to first in your life will always be your favorite but that's not necessarily true. Not trying to change subjects, but I'm a huge Superman fan. I grew up during the John Byrne era and those were the first comics I bought. However, now that I've read all the different eras its the Curt Swan silver/bronze age version that I like the best. So I totally see where you're coming from. There's a certain magic to days gone by and the products of that era. I was born in 1982, but I have a huge fondness for TV and all media really, from the 1950s, 60s, and 70s.