Hi. It's definitely a personal choice as to whether or not something is worth the cost. And it's really easy to say "yes -- I always want to stay CL" if you're not the one paying for it!
So, I'll give you my opinion on this one. We've stayed at Club Level and regular rooms several times each at WDW.
In addition to the "snacks" which to some of us are more like meals (just depends on how much food makes a meal for you), you get the pre-planning help of the IPO. At the Poly specifically, you also get the beautiful lounge with a view of the MK fireworks and you know exactly which building you'll be staying in. Like all lounges, there are drinks available all day, CMs to help you with your questions or to make any last minute reservations you might need. It's just more detailed, personalized service, really. The IPO at AKL has bought a few items for me and they will be ready and waiting (hopefully) in our room when we check in. They are a surprise for my DD.
As to the cost... honestly, it's hard to justify it for me. At AKL, I'm only paying 40 or 50 dollars more per night, and I have no problem saying that it's worth it. When the difference becomes hundreds of dollars a night, I usually pass on CL, at Disney as well as at other destinations. Would I pay full price for this? No. But it's a nice perk, I want to be spoiled on this trip, and CL rooms were included in the 4/3 deal.
If someone offered to pay for it for me, I'd always stay club level.
But since I don't have unlimited funds, I choose carefully when to stay there. We've spent about half our time at WDW in club-level and half in regular rooms and we've always had a great time. It's a nice "extra" but definitely not a necessity.
Hope this helps... Haven't stayed yet at the Poly, so I can't give you a definitive answer.