I am a Neurocritical care fellow. I don't think this will change anyone's mind, but here is my perspective.
First of all, to answer your question about whether it is worth it to add a year of Neurocrit on top of CCM: I don't know. Probably not. There is probably going to be an increase in the demand for Neurocrit trained folks over the next few years as more places start/expand their mechanical thrombectomy capabilities for large vessel strokes. How exactly this will translate into specific job opportunities that would not be available without NCC training is unclear. I'd say do it if you are interested in working with TBI, SAH, or cardiac arrest prognostication, otherwise it would probably be not worth it. Even then, it would be a year of lost attending income, so you could say this would cost you like $250k in life time earnings, so that's something to weigh in the pros/cons.
The joke about NSICU being an ICU with salt overload and poor general critical care management has a grain of truth to it. But so does the converse of other ICUs having terrible neuro care. And unfortunately the actual patient impact is not likely in favor of CCM in this comparison (ie my patients are relatively healthy from the neck down, so my poor vent management/poor Crit Care doesn't do that much harm; but you end up withdrawing care prematurely on post cardiac arrest patients because you didn't recognize NCSE or misunderstood what myoclonus means in that setting/can't differentiate it from Lance Adams syndrome, or failed to appreciate the significance of the location of the insult to prognostication, etc etc). At my institution we do consults in other ICUs for cardiac arrest prognostication and some other issues like ICP management, and well... let's just say CCM folks don't know what they don't know.
Jokes aside, this whole thing about Neurocrit being a 'vegetable garden' is kinda outdated and shows a lack of understanding of the literature on long term cognitive outcomes. Poor long term neurologic outcomes are a lot more common in the general ICU population than a lot of CCM practitioners seem to think, and are a lot better in the neuro world than you'd think (mostly have to look out far enough; for example, most survivors of out of hospital cardiac arrest actually do great neurologically if you follow them out for a year, and most of the bad outcome is attributable to mRS = 6 (ie death)). Difference is, we actually target our therapy for that, which is a lot more patient centered IMHO.
Anyway, most good fellowships both in CCM and Neurocrit are multidisciplinary with multiple months of either spent in other ICUs (CCM fellows at some institutions spend several months in the neuro ICU, Neurocrit fellows spend several months in the MICU/SICU). Some of the comments on this thread make me think that maybe these folks didn't get as well rounded a training as would be considered good these days, which is unfortunate. But hey, nobody is perfect.