This BTTF fanatic totally gets it watching the trilogy at least 1,300 times.
www.mirror.co.uk/news/weird-news/fan-who-fires-up-back-5481018
That was also true in my case.
I believe I first saw BTTF2 around 1990 around the time BTTF3 was released. It was on Showtime, and I was instantly hooked. Then I recorded it on a blank VHS tape which was one of the first movies I recorded from a VCR. I got an original VHS copy of BTTF1 and would wear it out too. When my Stepdad was still dating my Mom, I remember we were eating dinner and I had BTTF playing in the background. I would quote each line and my future Stepdad would laugh. BTTF3 was the only one I saw in the theater. I was kinda disappointed because it turned out to be a western romance film. I didn't care for Clara. I wanted Doc & Marty to continue their adventures and close friendship.
But it is true. I used to catch something new every time I watched it and this was probably after 30 times. This was circa 1990-1991 pre-Internet days when my only video game console was an NES and watching TV was usually my whole life after school if I wasn't playing with my friends outside. This was before DVD bonus material and Google search can point out every little detail and ironic line. With Zemeckis' most famous film, Forrest Gump, it also had great replay value. I learned new things after rewatching it. Same with Tarantino's Pulp Fiction. But after maybe 10-20x seeing them, they eventually get boring or I just don't feel attached to the characters like I do with BTTF.
I don't care for Forrest, Jenny, Lt. Dan, or Bubba. I don't care if Jules saw devine intervention. He still capped a couple of guys just hours before. I don't care if Vincent Vega dies since he chose that path and is a heroine addict. I don't care for Bruce Willis as an actor and he gets away with it at the end with the "Zedd is dead" line. I own Donnie Darko and Looper too, but they both don't have the same replay value for me after 10x either. Downer endings. But Marty and Doc going on time travel adventures trying to stop Biff again and again? Hell yeah! Some of my favorite episodes from Family Guy, Futurama, and LOST are "Meet the Quagmires" (homage to BTTF1), "Roswell That Ends Well" (inspired CollegeHumor to make Marty his own dad) , and "The Constant" (the conscious travels back).
I love time travel comedies because I think alot of people want a reset button with their life or want current nostalgic feelings become reality again. And it can be hilarious with the potential consequences. I saw pix of the cast reunion. Wow, Lea Thompson is much hotter at 54 than the 47-year old Lorraine in 1985. I didn't get into Star Wars until 1997 so she was my Princess Lea as a child before I saw Carrie Fisher. Some great stuff this week with BTTF and Star Wars 7. I think the best prediction BTTF2 got right is a baseball team in Miami so I am really rooting for the Cubs to win the World Series to make Cardinals fan, Bob Gale, look more genius!