It's a great reminder of how good this feature is that we take for granted. I think this outage has actually improved my appreciation for Gmail (a service I normally only complain about).
Seriously. I didn't even realize this was a wide issue, but I couldn't find a school enrolment email I was looking for this morning, and found it in the spam folder. The fact that I basically never have to do this is actually amazing.
Yeah i have fantasies of having my own email server and stuff but the spam detection is probably the 3rd thing that would have me crawling back