I don't know what constitutes "childhood" so I'll say up to age 16 which for me was 1985. My list begins with the Star Wars trilogy, the real one, not the one with the cartoon rabbit that steps in the poopy
Also going to list Raiders of the Lost Ark. I don't have a number one favorite movie of all time but I'd say that Raiders and Empire Strikes back are co-owners of my number one.
Also loved Close Encounters, ET, Superman 1 and 2, Back to the Future, Karate Kid, Rocky 1-4, Gremlins, Conan the Barbarian, Goonies, Ghostbusters, Trading Places, Tron, Beverly Hills Cop, Revenge of the Nerds, Star Trek 2 and 3, Cocoon, The Last Starfighter, Jaws 1 and 2, Red Dawn, Police Academy, King Kong (1976), Smokey and the Bandit, probably several of the classic Disney movies that I saw when I was very young like Bambi, Cinderella, etc.