Eeehhh... BugCatcher is a much better option for this than No Thank You.
Suppresses error messages, makes them available for review if you do want to look at them later on, and it does the job reliably with no extra frills or unexpected features. In particular, NTY suppresses a lot of other things that I do care about.
The error dialog is anything but useless to Addon developers, and many of us will request the stack trace because 9/10 times it points us to the exact line of code that generates the error. We can then backtrace the possible sources.
And how many users do you estimate, would report such errors if there were no dialog? 0, zero, nada, noone or of the full population, exactly only you? I mean, from your original post I read between the line that you never report these errors.
How exactly would that help to improve addons?