[Bost]

I use the WinKey extensively. My top two contenders are:

  s-c  sp-copy-sexp
  s-b  sp-backward-copy-sexp

followed closely by:

  s-p  helm-projectile-find-file
  s-f  helm-find-files
  s-r  helm-recentf
  s-R  spacemacs/rename-current-buffer-file
  s-0  delete-window
  s-2  split-window-below
  s-3  split-window-right-and-focus
  s-D  dired-jump

:) The rest can be enjoyed here https://github.com/Bost/dotfiles/blob/master/emacs/.spacemac...