OP said December, but to be honest, I didn't pay all that much attention to the specific dates. But here are some specific rates...
I have a Standard Club level room at the Bwk (Xmas week weeknight) at $1077/night with tax, and that is higher than I'd want to pay, but a Standard non-CL room the same night is $783/night w/tax.
So the difference between CL an on-CL is $294 per night...or if OP had two rooms that would be $588 per night.
YC non-CL stndrd view room is $748, and Garden view $759, while
CL garden is $1054/night w/tax. So the difference there is $295/night for a Xmas week weeknight.
Earlier in December though the YC rates for garden view are $573 non-CL Garden and $887 CL water view. So the difference is $314/night for CL vs. non-CL per room.
Also, over Christmas week- a deluxe alcove suite (lowest room category that qualifies) at the Swan is $578+resort fee = $612/night. So that particular week, choosing the Swan suite is only $275 less/per night than the YC room.
The way I see it, it really depends how many people are in the room. If we say the CL difference is about $300/night, and you have five people in the room....then that works out to a rate of $60 per person for CL at YC (vs. non-CL at YC) or $275/night for YC CL over a suite at the Swan. And at the Swan...only 4 people are allowed in a deluxe alcove room.
Generally, I agree that CL is not worth $60 per person.
It would really depend what if any discounts WDW ends up offering, how much they are using the lounge, and how much they value the reserved fireworks seating. If WDW ends up offering 30% off, then CL, IMO, is probably worth $42 per person. The
DDP is $75.50 per day for anyone over age 9 ($26 for kids 3-9)! CL doesn't quite cover all our food, but it covers more than 60% of our food costs....and the OP would be weighing the value of the extra FP PLUS the value of a reserved fireworks viewing area. Over a holiday week...the value of a reserved fireworks spot is significant!
I'm currently looking at a summer rate where non-CL is more or less the same price as CL (though the non-CL is slightly better view).. so that's kind of a no brainer.
Much of the year, we typically have been able to get WDW CL's for about $150 extra per night, so for 4 people that = about $37.50 per person. Now if you'd stay in a condo and go to a grocery store for your breakfast, your food will cost less than that. If you compare CL rates to the cost of eating at the Swan's breakfast buffet instead every morning...then that rate is more comparable.
It is also hard to price the value of one's time. Anyone who tries to eat in a WDW food court at 8am over a holiday week IS going to lose time standing in line and waiting for their food order. You can also forget about getting a latte at the MK Starbucks unless you are willing to lose 20-30minutes. When we stay CL, we have immediate access to the CL latte machine. I can't say what that is worth to anyone else, but for me, even a free latte isn't worth losing 30minutes of MK time.