FFVI and FFVII I grinded through to nearly the end. With FFVI I had left it for a couple of months and when I came back to it I couldnt remember what to do next - this was 1996, pre GameFAQs mind ;-)
FFVII, got all the way to the end, but wanted the best summoning/materia/forget what it was called to beat the final boss... involved lots of breeding of chocobo and racing them. Got bored sick of this, and never went back to the game.
Chronotrigger has its sad moments, theres a character who' is in a wheelchair because of a terrible accident. At a certain point in the game you get to go into the past and prevent it from happening, but ham-fingered that I am, I faffed it up and failed. Bah.