I was raised on Next Gen and there was actually a time when I was about 9 years old when I had seen all of the original series movies (renting them from the local library) and did not even KNOW there was an original series. I thought it was just the movies and then Next Gen. From that perspective, it puzzled me how TMP could ever have spawned so many sequels and an offshoot tv program. I guess what I'm saying is that it doesn't really stand on its own. The few original series episodes I have seen are lacking something, perhaps only superficial things, but growing up on Next Gen, it is hard for me to appreciate the original series the way I'm sure many of you do. But the movies, beginning with WOK... well, that's more like it.
Born in '83, I am also a TNG child. I was aware of TOS and the movies from a relatively young age, but slavishly stuck to TNG and future endeavours, for a long, long time. I had a resistance to going backwards. I thought "newer = better". But then I grew up.