Hi Aquelarrefox,
You’re right about NYGM and GWX.
WAC i don’t really know as i couldn’t go that far with all the CTDs (and i gave up)...but my first experiences in it closes to what you said too.
I can comment about Ccom12 as I’m a big fan of this mod.
First of all, Ccom12 as LSH3 have the best ships variety of all mega mods available around

They all have been re-worked for an awesome rendering.
Ccom traffic is very various, quite different to LSH3 though, with more small light escorted convoys at war start, plenty coastal traffic everywhere (at war start) and enemy planes patrolling along the British coastline.
What I really like is they are not sitting ducks for figuration. They really defend the British areas, always asking for reinforcement as soon as you are spotted.
Later in the war, you have still here and there lonely ships to attack, but more of all sizes convoys sometimes very well defended.
Some of them have carriers and send their planes patrolling around the convoy to avoid U-Boat attacks. Very hard to shadow the convoy in such conditions I tell you…
Also German harbor traffic is very well done with plenty sea patrols and air patrols (but no CTDs...)
Also was pleasantly surprised to see Luftwaffe (end of 40) attacking my convoy 700 km west of ST Nazaire and sinking 4 ships! As the British, they are not for figuration!
I really like ships behavior, planes behavior, even if they are really dangerous (they can be up to 7 to attack you simultaneously!) and become your worst nightmare...just as i believe it was in real.
But what i prefer in this mega mod is everything is all included. No need for extra mods that certainly will break the base! All is in there, except the nice U-Boats models you have in WAC5.2.
I have tried to import them with some success, but Ccom become unstable with the exact WAC problems...so i gave up.