Are you sure about S2? I could have sworn I saw a Season 2 and had to do my usual "old man with remote control" dance trying to figure out how to cue up Season 1. (But maybe this is just "old man being confused by two different shows".)
Actually, I never read
It. The last Stephen King I read was The Dark Tower, and by that point I was just exhausted with the guy. Before then... I remember reading
From a Buick 8 in an airport, and thinking it was the worst book I'd ever read; then seeing the film adaptation and marveling at how much worse they'd somehow made it.
I'll definitely keep Welcome to Derry in Mind, though!