Thanks for reporting your actual experience, and I'm not surprised you were told all would be fine. Do you remember being told about a 3-hour limit? The reason I ask is that over the years we have had several dinners at Flying Fish during Epcot's food and wine festival - each time we were told by the guard that we could valet or self-park and no one ever mentioned a 3-hour limit. We chose to self-park and always found a spot, although the spots were pretty far back. I'm fine with following rules as long as they're set by Disney and not just made up by other guests.
The OP asked about having dinner at the Contemporary, then leaving the car and walking to MK for a few hours before it closed. He or she planned to ask Disney personnel if it was okay to do so. That seems like a valid question, and I can see Disney being alright with it, provided there was sufficient parking that day. Of course, people have every right to express their personal opinion about whether what the OP asked about was (or even should be) allowed. But what's with all the exaggeration and end-of-the-world scenarios? The OP didn't say anything about staying offsite, making breakfast reservations every day and then using the resort as a theme park lot. OP didn't say anything that would lead to the suggestion that they thought it would be okay to block someone's personal driveway. That seems kind of heavy handed.