I was just born around when it was a new show (providing it was between 1981-82). In 1998, I rented a copy of Marvel Comics Video Library which contained: Revenge Of The Green Goblin as well as the 60s episodes Diet Of Destruction/The Witching Hour.
Later, I manage to get various tapes (recorded or home video) containing; Bubble Bubble Oil And Trouble, Doctor Doom Master Of The World, When Magneto Speaks People Listen, Curiousity Killed The Spider-Man, The Incredible Shrinking Spider-Man and The Vulture Has Landed. I rented another MC Video Library, this time with Arsenic And Aunt May.
Got to see nearly all of the series online recently. As of now, the only ones I haven't seen are Return Of The Kingpin and Under The Wizard's Spell.
Never got to see the airing of the show in 1999 as we moved to a city that didn't have UPN.