Staying CL alone cannot get you preferred fireworks / nightime show viewing at any park. Guests staying CL (and select other room types) are currently eligible to participate in a
paid trail program which gets you three “extra” FPs per day (in addition to the “regular” three per day) along with your choice of reserved nightime viewing at HEA, Illuminations, Fantasmic, or Rivers of Light.
Details of the program can be found here:
https://www.disboards.com/threads/f...ng-cl-fp-trial-program.3538258/#post-56320893
And lots of strategy discussion here:
Club Level Fastpass+ Purchase (Logistics)
Staying CL gives you access to “Disney Signature Services” (DSS) which is a “concierge-like” group that can assist with various planning needs. Generally speaking they cannot do things that you otherwise can’t do yourself. For example, if you can’t find an Ohana ADR on a certain date, they won’t be able to either. They don’t have a secret stash or any special pixie dust to make things appear. On rare occasions you’ll see a report of DSS “really helping out” - but that’s the exception and not necessarily the norm.
Generally speaking, one will not find “perks” when dealing with DSS or CL CMs. Disney CL is not to be confused with something like, say, a Four Seasons concierge, who can go “make things happen” for you.
For many, the CL appeal comes more from the food/beverage offerings, the dedicated lounge, the location of CL rooms specifically (often high floors or particular buildings, depending on the resort). “What a concierge can do for you” is not often cited as a major benefit - mainly because the app and website make things so easy to do yourself.
That being said, access to DSS pre-trip and CL CMs during your trip does offer a bit of convenience. For example, you can e-mail your room requests to DSS and they will note it on your reservation. No calling, waiting on hold, etc. Communicating directly through e-mail has its advantages at times. You can book various things - tours, cabanas, events - with a few e-mails back/forth vs having to call.
That’s my take, others may have a different perspective as well. Hope that helps.