You answered your own question at the end of your own post.

You said "(yes, that's my
opinion of what's happening...YMMV)".
YMMV ... "your mileage may vary." That's exactly the reason why some people still believe -- and, therefore, insist -- that there is nothing wrong. Because they honestly either don't see it, or it doesn't bother them. Their
opinion is that everything is as it should be. You see a dirty bathroom and think, "Dirty bathroom -- I'm so mad at Disney ... why is this bathroom dirty!!" Others see a dirty bathroom and think, "Dirty bathroom -- I feel so badly for Disney ... I can't believe that people can't pick up after themselves." Still others see a dirty bathroom and think, "Was the bathroom dirty? I didn't notice. I'm on my way to the Haunted Mansion!"
Part of it is perception. Part of it is the whole half full / half empty thing. And part of it is that you are seeing things in a single moment in time.
When you see a dirty bathroom, or a piece of trash on the street, or a group of unbussed tables at a CS restaurant, you are seeing one moment in time. Unless you stick around to see how long it stays that way or were there to see what may have caused it to be that way, it's hard to generalize blame. I mean ... all of us have had those moments where we looked great until five minutes before the job interview when we spilled coffee on our shirt. But should someone assume I'm a slob because there's a coffee stain on my shirt?
Some things -- chipped paint in a resort room, undercooked or overcooked food, rude wait staff, frayed rugs in the lobby -- are obviously things that Disney has overlooked, although until you complain or mention it to someone, you don't know if it's being dealt with. The chipped paint may be on the maintenance log for that day as soon as you check out. The chef serving undercooked food may be new. The rude wait staff may have a coaching session scheduled with management that afternoon. The frayed rugs in the lobby could be being replaced the next morning. Or ... they could all be signs that something is terribly terribly wrong.
If the majority of the bathrooms you walk into during your five-day vacation are a total mess, then yeah ... Disney is missing the mark bigtime. Complain. Rant. Rave. Take pictures of each one and put them on a "Disney is a mess" website. But if it's one bathroom on one day and every other time was what you would personally consider normal wear & tear for a high-traffic location, then maybe it was just luck of the draw.
As you said earlier, "YMMV". What you consider to be filthy dirty may be perfectly acceptable to someone else. What you consider to be bad food quality may be someone else's favorite restaurant. You are the spokesman for only your vacation and only your experiences. Which is how some people can still insist there is just nothing wrong. Because their mileage varies from yours.