Hey, cool!
So nice to have my old posting referred to. Guess that makes me a star!
Yep, what everyone says seemed to be true when we were there a few weeks back. If you're staying off site, expect to be held at the TTC until official park opening time, unless...
You stumble upon the way around this like we did by booking a Character Breakfast at 8:00am (or earlier). This got us into the park and in a primo spot for touring because we were already in the middle of the park and were done eating by about 9:10am. Both Crystal Palace and Cinderella's Royal Table do early breakfasts (and both restaurants are good food and very fun), and MK CM's were letting people onto monorails if they had Priority Seating reservations for both MK breakfasts and also character breakfast at the Contemporary (Chef Mickeys), the Grand Floridian (1900 Park Faire), and the Polynesian (Minnie's Minnehune). All five places will get you past the TTC prior to official park opening time.
However, remember that with the latter three restaurants (all at monorial resorts), you'll need to hop on a monorail and/or figure out a way to use one of the resort "launches" (aka--smaller ferry boats) to get you to the MK main entrance. And with gobs of people going from the TTC to the main entrance at park opening time, you probably won't find much room on the monorails for a while until the crowds at the TTC thin out.
I'd advise you to figure out your MK entrance strategy, anticipating the worst (like a half hour wasted just to get inside the park), and once you know what you want to do, go back to this site and post a similar thread to this one. Perhaps you'll find some different answers since what I got was that Disney keeps changing how they do things.
And yeah, my family arrived early thinking that they let people into Main Street early and found that not to be the case any more.