I don't remember it taking me a long time to get in and out of back then, but then, that was over 20 years ago, and I probably wouldn't have cared about time and effort back then, so I might not remember.
I think parking and entry to see Round Rock's fireworks at the Diamond was a pretty easy ordeal though. But same story, I might not remember. That's the one I usually took family to if they came to visit, and I don't think my dad would've put up with long entry/exit times, so that's my rationale.