I lived several summers in Yosemite as a kid. My mom was an administrator for the Curry Co that ran all the concessions. I was never much of a technical climber. The ladder up the back of half dome was scary enough for me. I did do the face of Clouds Rest with my dad. But mostly we just hiked and mountaineered in the back country.
That movie brought back memories. I was there in '68(?) during the "riot." It was rangers over reacting. I was about 14. We were mainly riding the busses around the park getting high and drinking beer. Camp four was just as shown in the movie. I knew who Harding and Royal Robbins were but they were about twice my age.
I think there's a lot of restrictions now, mainly due to dummies getting in trouble needing rescue. And it's all about money. Last time I was there was about 12 years ago. We stealth camped in my various secret spots without trouble (since it's impossible to get reservations).
Now that I'm old, my idea of camping is a motor home with satilite, and if you want to reach the top of a mountain - that's what helicopters are for.