“Worth it” is something no one can answer for you, about anything. It’s too subjective. All we can do is offer you the info to make the determination based on your wants/needs/budget.
That said, the Poly doesn’t have cabanas, it has a trio of patios available at the Oasis pool, which is the leisure pool at the resort. I say that to set the expectation...they are much cheaper than the cabanas at the other Deluxes that offer them but it’s because they don’t come with the same amenities. The Oasis patios give you some nice covered seating including a padded lounger but no cooler with fruit tray & drinks, and it’s open air so no ability to close it off for privacy. Here’s what they look like (I took this pic from the lounger):
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A CM will take your food and drink orders for the Oasis Bar & Grill. (Hopefully by your trip in Nov. food will be back on the menu. It’s re-opening just with drinks.) The pools at the Poly are fairly close enough to each other that it’s not terrible to use the patio as a home base if someone wants to go to the Lava pool to use the slide or something. In normal times you can book half days or full day, right now only full days are available.
My gf and I enjoyed our patio a lot back in Oct 2018. We booked a full day before going to MNSHHP that evening and plan to do the same thing when we go back this fall for whenever we go to the Boo Bash. Pricing is seasonal; we paid about $75 for a full day in late Oct.