Earlier today I prepared a set with a few pictures to upload to Commons forWiki Loves Monuments when I noticed the Romanian language upload wizard is not working, it is the default we use and promote. The bad part: nobody complained, even if it was not functional for almost a day. And we were wondering why the contributions slowed down!
Once the problem was found and reported, it was fixed and now everything works again (it affected other languages too, at least French and Polish (languages with plural forms for words), which also took important upload hits yesterday.
The conclusion I draw from there: we are too used with websites not working, we say "I'll try later" and go on with our lives. Nobody bothered to write a few words in the contact page, even "you suck, upload is borked" would have been very useful.