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This just happened to me: 

  1. dragged a folder into a Sublime Text 3 (beta) window, 
  2. realised I had accidentally dragged in the wrong folder, 
  3. right-clicked the folder in the sidebar and clicked "Delete folder"

Realised I meant to click "Remove folder from project". 

Too late. All gone.

The best part is this: it was a version-controlled project folder, but ST3 even deleted the .git subdirectory.

A single click for a recursive delete operation, with no prompt, and no way to reverse it afterwards? In a context menu that also contains a similarly named non-destructive operation which is used frequently?