Thanks for the photos, we are in 6154 for a September cruise. Are the hallways that lead to these rooms wider too so the wheelchairs and powerchairs can fit through easily?
On the Magic and Wonder? No. They are the same size as most of the hallways (found the hallway to the medical office to be a bit narrower at some places). All of the hallways are wide enough for any chair to navigate as long as the user isn't totally navigationally challenged. When the stateroom hosts are cleaning and the cleaning cart is out, they can sometimes be blocking the hallway. However, they will move that immediately where need be. I've found the hosts on my floor very soon learned about us being around and our routine and mostly were proactively in not blocking. If they were, it would take me about 5-10 seconds to find them and have them move it. No biggie at all.
There are cut outs in the wall where the doors to staterooms are located, at which level the hallway is wider that at the other points. These areas are perfectly suited to cross said cleaning cart or for instance pass another wheelchair user, buggy user etc. This is one big reason why it is so important to NOT leave anything out there like for instance while charging an
ECV: it can block others using a mobility aid in their way.
Depending on the location of the accessible staterooms and the aid used, some require a rather sharp turn to be made before entering the stateroom. For instance the cat. 11B staterooms on deck 6 (haven't been able to check those on deck 7 myself) require a 90 degree turn in a somewhat wider part of the hallway but still not that roomy. I could see where this could be a thing for ECV-users that don't have navigating in tighter spots down. Accessible staterooms that are on the end of the hallway, like for instance 6154 and 6654 can be located in such a way that the door is facing the hallway and you can basically drive straight in. Again, this all depends on location (some decks have multiple staterooms on the end that can influence doorlocation) of the stateroom, type aid used and driving skills.
While I'm used to navigating the tightest of spots and my powerchair has a very small turning radius (before moving onto a wheelchair 24/7 and later on powerchair, I used an ECV and am thus familiar with it's (in)capabilities), I found the overall space onboard to be big enough to allow for very proper accessibility without having to jump through hoops constantly.
Some things might be a bit more of a challenge when for instance using an ECV that has a low cut out underneath. I could see them having a challenge there or even getting stuck on some of the ramp thresholds when having the right combination of factors like for instance what I call a poor quality ECV or other mobility aid, a fear for attacking those spots with the right speed and angle, not having the physical capabilities etc. But with a powerchair? Have yet to run into that.
No 6654 for me this cruise, I'm in 6647. Couldn't justify the price difference with me cruising solo and the door thing. Too much frustration for too much $$ that now bought me 2 weeks at WDW afterwards. 
For our cruise 6654 is booked, only concierge is left in acc. staterooms. Who knows, wouldn't it be close to a miracle if indeed they'ld upgrade those needing these staterooms and normally having no real shot at an upgrade... 
