Sorry. Disney isn't catering to people who pop in after work.
And even then, you can make your 3 FP+ or try to book them that same day on the app.
My statement wasn't on it's own. It was in response to someone saying they don't go to Disney World anymore and you don't get your money's worth. Sure that's subjective... but so is your statement saying you rather pay $100 for a concert instead of DHS. Okay, cool. So a concert is usually 2 hours of entertainment. You can spend 2-3 hours at DHS watching shows and nighttime entertainment alone. That's not including any rides, character meet and greets, streetmosphere, shopping, dining, etc.
Obviously value is subjective. It's probably the most subjective thing on the planet. But no one here is paying $100 to get into DHS.
Slow service and poor food because you didn't "plan before hand"? You're not even relating sensical things. Now, a 2-hour wait at primetime for dinner because you didn't make a reservation. Now that's where planning could have been helpful. See the difference?
If you're not advising people who are looking to visit Disney parks to get their at park opening to maximize their time, or to take advantage of FP+, or to take a break in the middle of the day and come back at night, etc, you're basically doing them a disservice. Sorry. I don't know when it was a good time to just waltz into a Disney park and to expect to have access to whatever rides at whatever time but it's definitely not the case today.
So plan accordingly.