@heidijanesmith covered it very very well, in my opinion.
Somewhat embarrassed to admit this, but DS and I got a cabana for just two of us last Sept.
Overkill? Yes.
Really did it more for shade, shade, shade, convenience, a place to rest (read sleep, it was the day after a
MNSSHP), space, the locker that comes with it, water, etc. It was ‘really’ hard to justify the cost for anything other than a flat our splurge though.
One negative - for maybe a year/year+ the cabana food menu is not really tailored to individual meals. Most of the menu is for large groups. You can’t just get a turkey sandwich, you have to get a turkey sandwich platter which serves like 10. Chips and salsa? You’ll get enough to feed an army. All with a corresponding massive cost too.
Later in the day our attendant said they’d recently changed things so he could also go get items from any food stand in the park, but 1) he didn’t offer that up until late in the day; and 2) not sure how legit that is.
In our conversation he seemed to indicate the “platter” menu would be changing, so they may not be doing that any more... so YMMV. The experience above was 9/2017.
Hope that helps!