I had made a post about this right after TWW went live. After a lot of testing and reading every post i could find about it, i found there were four new video setting in the graphics tab. Its the last or bottom four. I unchecked them and havent had a crash since. Not sure if it will solve anyones issue. But easy to check, and an easy fix if it works for you too. The game was unplayable for me as I use my map a lot. Hope this helps.
Yeah, I have those turned off and it still causes problems 
ty this been happening to me all this time and i changed render scale back to 100 and can see the map finally ,hope it last
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This seemed to fix mine as well, some sort of combination of the map and dynamic flying and trying to render tooltips (mousing over things on the map while flying) was recreating the problem 100%, and my render scale was set to 99% for some reason, changing to 100 and it went away.
Still happening, for 4 months now. For me, disabling add-ons doesnât resolve it, dropping those four new graphic settings doesnât do it.
The only thing that works 100% for me, is to not use skyriding, and just fly via the old style, though on alts that are still levelling to 80, they canât even access that old style, so that sucks.
I just try to stand still when using the map, never enter the map when an add-on finds a rare and displays that on the screen (guaranteed to freeze then), and try to give it a few seconds of standing still after mounting.
Pretty poor Blizz.
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Full interface reset / reinstall with deleting all the game folders (or at least rename them)
I had this issue and fixed it by making sure my render scaling was set to 100%, but reading up on it there seemed to be a few issues that would cause it.