I missed TOS on first run, but caught it in reruns/syndication before TMP.
So, needless to say, my Trek fandom predates TNG.
Same here. I was born in April, 1970, and was "weened", you might say on TOS by my mom, who watched it religiously during it's NBC run, and all the years afterward. By the time TNG came along, I was 17, and had a well-defined "Star Trek love", if you will. So yes, I'd have watched TOS even if nothing else had ever been made.
But I'm glad they were.