It is a luxury vacation compared to its competitors, at least in my opinion.
Competitors as a theme park? Or as a resort?
That distinction also is helpful because it's possible to be really good at one.. and not at the other. The product isn't necessarily uniform in it's delivery or service level.
I mean, we all know Disney offers world class attractions. They have some of the top (lets use the term) "rated" attractions. But I wouldn't label them "luxury" I would label them "premier" or "top notch" attractions.
Disney has quality facilities - like the bathrooms and grounds. But are they "luxury"? Or just really well maintained? They are decorated, but really elaborate. There aren't premium products or helpers there, etc.
Luxury in terms of amenities and services usually convey great personalization, attention to detail, inclusive, and extended efforts to avoid burden.
You don't goto a 5 star luxury hotel and wait 45mins in a lined queue... because "everyone is the same".. you get service that makes you feel like a king.
That's why I would say "Disney is top quality" in many ways.. but I would never use the term "luxury". I can't really think of anything in a WDW experience that compares with a "luxury" offer you get with true luxury brands.
At the theme park it was soemthing that really stood out to me at Discovery Cove.. it actually did feel more like a classic luxury experience. Very tailored, everything was at your disposal, everything was just provided, you weren't herded like cattle, the guest to employee ratio, the pressure level, etc.
I mean... Disney barely gives you housekeeping.. and is constantly forcing you to self-service everything... nothing like luxury level hotelier services.
The theme parks are mass market -- lacking any personalized services or isolation. Even paid upgrades like Desert parties etc are people contending for shared spaces for a good view, etc. That's not luxury.
At least on the cruise ships you get some elements that are closer to luxury.. like the employee to guest ratios.. the personalization.. the hotelier services... but that is very much in pockets, while other areas are very much still mass market.