We just did a 3 night on the dream starting 10/27 and we did go to Enchanted Garden on our Nassau day. It was buffet. We were there late so not sure when they opened. Only menu table service breakfast we saw was Royal Palace
Edited - It's still sit down compared to Cabanas where you won't have servers and grabbing your own seat.
I just ate at the Enchanted Garden on Castaway Cay day on Sunday and it was a buffet. It is a much smaller selection of items, but also much more relaxed. I checked the navigator and it was open 8:00-10:30am.
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