A LOT! Most similarly priced hotels will have concierges with actual inside access for reservations, events, etc. Disney will help book a reservation but they are just using opentable or the onsite dining app. They have really no pull outside of their hotel, and even then only select hotels on property hold back some reservations for their concierge. Most similarly priced hotels will have around 3 to 4 really solid restaurants inside their property (the exception being Mexican resorts). Not talking counter service or buffets, but ones with a tailored menu and good atmosphere.
Pools - if there isn't a cocktail server coming by 3 times an hour, they are doing it wrong. (They are usually super friendly and they learn the good tippers.) If a towel sits in the hamper for more than 15 minutes, they are doing it wrong, if your towel looks wet and they don't replace it for you, they are doing it wrong. I know this sounds pretentious but that's the level of service you get at a $350+ night resort. (The exception here being the Bahamas, you're lucky if the cocktail waitress is around once an hour and returns with a drink in less than 20 minutes.) What's sad is that the rooftop pool at my old gym in DC provided better service and kept on top of the pool decks better than Disney does currently.
Front Desk - god, Disney, find some happy workers again. The saving grace here is that pre arrival check-in is now a thing at WDW and you don't have to deal with them often. I find most of the front desk at Disney to be very combative over the last 3-4 years for some reason. Most hotels their front desk staff are way more friendly and have more knowledge of their resorts (how is this still a thing?! how have cast not eaten at their hotel's restaurants? how do they not know the views from most room numbers? These are the things as a front desk manager at WDW we were harping on 10 years ago!) Again, most luxury hotels will get you whatever you need asap, with a cost of course. The answer is "would you like us to charge that to your room?" not, "you can call a taxi/lyft and they will take you to get medicine/food/diapers/etc at Goodings". Streamlined service is also a thing at most of these hotels. "Please go on about your day and we'll have it done by the time you get back" Disney is "Please wait. We need you to stand with me while I figure this out"
Amenities - most have a very nice spa, with a massage/facial readily available. Currently only the Grand has the scale of what other places would consider a spa. Yes other hotels have them, but they are sorta "meh" and you feel like you walked into a gym/nail salon/waxing studio/massage parlor in one kinda place.
Housekeeping - Disney used to be pretty solid here, not sure what happened. Lately rooms have been less clean, sheets are not changed as often, and the housekeeper doesn't recognize long term guest (more than 2 days). Many of them also don't seem responsive to requests. I think they are just spread too thin. Many (but not all) luxury resorts will use teams to clean rooms so they are faster.
I could go on. But I don't want to beat a dead horse. Look, I don't think Disney is totally off the mark here. They are close. It just takes effort and care about the impression guests have. With a few tweaks, they could be forgiven for not being 100% at the level of others, because yes, it's Disney and it's a theme park resort. But the attitude of guests being treated as numbers, and cast not feeling pride in the place (this is really key to a good resort, they should feel proud of the place and treat those staying as people they are excited to entertain). Every few years there seems to be a push for "back to basics" and every few years, it's lost in "keep your rooms full!".