Hey now, everyone. (And thanks for all the responses.) Anecdotes are welcome. Opinions are welcome. Both experience and speculation are welcome.
If I implied that I would rather avoid disclosure of the accident to NMAC, I did not mean to. Not the issue. I see specific language in my lease contract about disclosure - what is missing is any detail about how to go about it. I've called NMAC twice already (phone menu no help, on hold for a live person forever) and will contact them one way or the other.
I was really wondering whether anyone had had a "should have gone to a Nissan dealership instead" or "wouldn't take it to a Nissan dealership again!" experience with post-accident repair.
After a conversation with someone with my insurance company, I feel more confident that they will back me up if I find the repair unsatisfactory in some way - wherever I take it. I think I'll just go with the insurance company's choice of repair shop. Now that I'm thinking a bit more clearly about it, I don't think anything substandard about the repair would be waiting around to bite me in two and a half years.