One of the core tenets in advertising and public relations is to make people think their decisions and choices are their own. They want to subtle nudge you into believing something or buying something rather than try and convince you (because who the fuck is convinced by a 30-second commercial?) and they will do anything they can to do that, like, say, reshaping society itself. Modern advertising theory and techniques were in large part pioneered by the tobacco industry around 100-125 years ago (consumer goods IIRC was the other big one), and the entire point was to convince people to buy shit they didn't need and especially convince you to buy shit that was literally dangerous. Edward Bernays, founder of modern PR, was an expert at creating a lot of these tactics which are used not just by corporations but also governments. Definitely check into him if you want to know more about how this works and the theory behind it.
Disney has no doubt employed very intelligent people at their marketing and PR departments over the decades, and their strategy is incredibly well-crafted as you said. It's a brand as a religion, nostalgia commodified. You don't just see a Disney movie, you keep buying that movie and things related to it for your entire life.
I do wonder where the "brand as a religion" thing came from. It makes sense to think of selling a brand like that, since many religions have rituals involving newborn babies (infant baptism, circumcision, etc.) and at death that individual will be buried in a ceremony conducted in that religion (and they will often see clergy of their faith on their deathbed). Babies will be surrounded by the brand since the moment they are born since their bedrooms, clothes, etc. will be emblazoned with this brand. As they age, they will stick around with the brand and demand their parents help them consoom more. They can be married at a wedding themed after this brand, at a location significant to this brand. Their own children will be raised in this brand as well. When they are dying, they might watch a favorite movie one last time and they have the option to be buried in a branded casket (and yes, of course they have Disney funerals,
here's the first link that came up).
The above is interchangeable for a lot of major products, and a few not major ones you see weird boomers obsessive about like Harley Davidson motorcycles or KISS. For instance, Nintendo has increasingly embraced this as well. It's genius marketing if you can position yourself like this, because there are people who will buy product after product for the hell of it, because you've convinced them it's a core element of who they are as a person.