I'm just such a sufferer. Today, a meeting slipped through the cracks and I could not find the email requesting it. If I had just one productivity app and one email app, it wouldn't have taken me an hour to establish that I have no idea if I wrote it down. I am inundated in spam, spent half an hour trying to decide between IMindmap, Scrivener, or Curio to use as a corkboard. Tomorrow, I'm going to decide on 1 productivity app (Things, probably), 1 calendar (Fantastical), 1 email app (Mail), and.........Tinderbox, or Evernote, or DevonThink, or Curio, or Notability to keep my notes. I'm leaning toward Tinderbox.