It was easily verified as fixed with Open Cities. As long as I didn't step into an interior, I could enter a city, leave, go some distance away, then come back and everything was operating normally. Wash, rinse, repeat, and it was all fine right up until entering a shop, or going into Dragonsreach, or whatever. As soon as that happened, BLAM, CTD upon trying to leave the building.
Ah, that makes sense. It's clearly a ridiculous solution, but in theory, would the problem be solved by opening, well, everything? Putting everything in one space? So you have to open shop doors and walk in, etc.
I'd probably find that immersive, rather than loading screens, but I imagine it'd be hell on the hardware. Loading screens exist for a reason, usually.
(obviously this would only work with the old version. And is hugely impractical, compared to waiting for a fix...)