Bring up Airbrake, Exceptional, or whatever tool you use to track this and report your count. How do you stack up against the rest? Vote below and we'll find out!
I have also worked on a larger web app that would get thousands of exceptions per day.
I think near 0 is very possible as long as you aggressively attack all exceptions as they show up. Once you start letting some go they tend to pile up exponentially. I keep my phone on me and every time, day or night, that an exception occurs I get notified; it keeps me very motivated to fix problems quickly.
We now have fixed that and have tests for the more complicated code we have, but we don't really track exceptions. Besides Airbrake and Exceptional, are there any exception trackers for PHP / Symfony2?
90% done, only 90% left to go.
There's also a Symfony2 bundle contributed by the community: https://github.com/staffim/StaffimRollbarBundle