I never even checked out DISboards until after my cruise. I'm sure I'll get bored of Dis & Cruise Critic eventually but it's kinda my summer hobby at the moment.
People can have very strong opinions online when they aren't face to face. None of them will likely be on your cruise with you and Disney cruisers are the NICEST people I've ever cruised with.
You have PLENTY to be excited for with your trip. DIS actually doesn't have that much to do with your ACTUAL trip. If you need to take a break, feel free to. Otherwise, who cares if they have an opinion, you likely have one, they have theirs, the end.
Bee Happy!