My DH is a buffet-snob -- hates them.
That being said, there are some big differences AND advantages to WDW buffets.
They really do a very good job of keeping food fresh, hot (or cold if need be) and varied. We've found them to be a cut above a buffet you might encounter anywhere else.
But the BIG advantages are the time you save and the flexibility you have. It is hard to overstate how exhausting WDW can be -- especially how tiring all the waiting can be. It is hugely beneficial to be able to just get seated and then get your food -- no wait! And the flexibility is terrific too -- as much as you care to eat of something you love, no need to take things you don't like, OK to try something then go back for something else (huge benefit with kids).
Although we would avoid a buffet like the plague anywhere else, we do end up with at least one on each of our trips for the reasons I mentioned.
(Also, for what it's worth -- I tell DS and DH that if they want to sit with me and plan and research they are welcomed to, but if they don't then they can simply LOVE the choices I've made for them

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