I think it’s a limitation of traditional working hours and Orlando sprawl.
Let’s say you get off work at 4:30. The way Orlando traffic is at rush hour, it’ll take 45 minutes (at least) to go home and change clothes. Then it’s another 45 minutes (at least) to get to the parks. That doesn’t get you on property until 6pm at the earliest. And you still haven’t gotten dinner, yet. If you eat dinner, you’re not able to get into the park until 6:30 or 7pm at the earliest.
All of that is after working an 8 hour day.
When I lived in Orlando, I never went to the parks after work unless I was leaving work early (or going straight there to work). Traffic made doing so horrendously exhausting.