So, I'm a CL fan (and YC CL is generally in my top 3 behind Poly CL and CR CL)... but it really comes down to how you do WDW, IMHO. It's all so subjective and everyone does Disney differently, it can be hard to make blanket statements one way or the other.
For us the breakfast is a huge benefit. Simple things like having a fresh cup of coffee just steps away or grabbing a quick breakfast without having to "think" has a lot of value. I don't really love the YC or BC quick service options, so avoiding those also has value. We don't tend to do breakfast ADRs and the CL breakfasts are generally enough to pass as a meal substitute.
I find value in the occasional beer/wine/water/snack in our comings/goings during the day.
I enjoy the evening app service and, generally speaking, think YC does a decent job relative to other CLs. Not the best, but not the worst - nice variety and varying options. A lot of times we'll have a larger lunch out that day so the light evening apps are fine for dinner. Other times we do want a proper dinner so the evening apps are simply that - apps - or maybe we skip service all together. One thing we don't do is let the lounge dictate our schedule - if we're out/about so be it, if we're around the resort to partake, that's great too. The Epcot resorts area has so many fun reasons to not be around the room so it's debatable if we take full advantage of the lounge, but that's just the way it goes with how we travel.
Having dedicated CMs on the floor can come in handy sometimes - there's nothing earth shattering about what they can offer, but occasionally we've had MB problems, need to cancel an ADR, or small things like that and it can be more convenient than waiting in line at the front desk.
The YC CL lounge is a nice space - but unlike Poly or CR CL, it doesn't offer a special view or any "wow" factor to it.
A guaranteed fifth floor room means no one stomping around or making noise above you.
The math generally won't work out for most since nothing I note above is worth the extra cost from a pure $ point of view, it's more if you find value in the small conveniences that CL offers.
I generally don't recommend CL for park comandos or if you tend to eat out for every meal.
All of that is really subjective of course, but hope it helps!
FWIW, YC CL just reopened yesterday (after a nearly 2 year closure)... the early posts on the CL thread look really good (in my humble opinion), including a chef plating small apps for the evening service, which is new.
PS: I'm a Poly person too and that's where our heart will always be... but YC has probably been our second most frequent destination behind Poly. It's definitely nothing like Poly, but to me it's a nice contrast in terms of resort vibe, style, and nearby amenities.
PPS: The CL lounge has a freezer stocked all day with Mickey Bars and other treats. You won't find me complaining about that.