I grew up watching the series when it first aired back in the early '80's. It, along with The Incredible Hulk cartoon that aired at the same time, was my introduction to the Marvel Universe. I couldn't figure out why they weren't a team in the comics. At the time Spidey was doing his own thing, Iceman was in the New Defenders and Firestar was nowhere to be found. I'm amazed how little Marvel has done to capitalize on the show's popularity over the decades.
I had an old VHS tape with a bunch of the episodes that I practically wore out, picked up a bootleg DVD set eventually since it has never had a legit release in the U.S. and caught the reruns on Jetix when I could. Like you, I have never grown tired of it.
If you haven't discovered it, www.spider-friends.com/ is a good resource for fans.