I thought...
... searching in Spotlight for files that were "changed today" without giving any other criteria would show me, well,
all files
changed today instantly. It just searches forever without showing me anything. Is this a bug? Or just a bug on my particular machine? Or am I missing something? Please _test_ your answer before answering me, because I think I _did_ try everything... :/ (I even added a "size bigger than 1 KB" rule just for the heck of it...)
(Solved in comments..., thanks!)