Honestly, it's been a while since I used VS. I steer away from IDEs since they often are more cumbersome than helpful, but when I did use VS2015-17 the error list always just popped up automatically when I built/ran a project. It took a few seconds for it to come up and become interactable, but when it did, all I remember doing was using the arrow keys. Maybe I had to tab first, but I don't think so. If I needed the error list without running the program, I just alt keyed to the view menu and selected it because I kept forgetting the hotkey.
I've never had much trouble with NVDA and Visual Studio, and I never used any add-ons for it. If I had trouble, it was minor and in functions I rarely used. It seems like updating the program was a bit of a headache and I wasn't very fond of the changes made in 2017, but I could always get around just fine.
The program was plenty accessible for me. I just prefer using plain text editors with no frills. Although having a jump to line *AND* character position would be nice.
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