Evilで、スペースキーを起点としたキーバインドがかなり快適 ref: http://qiita.com/acro5piano/items/adaa18258435b870441e

file1.txt

(bind-key* "ESC" evil-mode)
(add-hook 'evil-insert-mode-hook 
          (lambda() (evil-mode nil)))

file2.txt

(defalias 'evil-insert-state 'evil-emacs-state)
(define-key evil-emacs-state-map (kbd "<escape>") 'evil-normal-state)

init.el

(require 'evil)
(evil-mode t)

(if (evil-mode)
    (progn
      (bind-keys :map evil-visual-state-map
                 ("TAB" . indent-for-tab-command))
      (bind-keys :map evil-normal-state-map
                 ("SPC b" . ido-switch-buffer)
                 ("SPC f" . projectile-find-file)
                 ("SPC a" . helm-do-ag-project-root)
                 ("SPC x" . smex)
                 ("SPC s" . save-buffer)
                 ("SPC d" . dired-jump)
                 ("SPC k" . kill-this-buffer)
                 ("SPC r" . ido-recentf-open)
                 ("SPC 1" . delete-other-windows)
                 ("SPC 0" . delete-window)
                 ("SPC q" . delete-frame)
                 ("SPC t" . xref-find-definitions-other-window)
                 ("SPC y" . browse-kill-ring)
                 ("SPC u" . undo-tree)
                 ("TAB" . indent-for-tab-command))
      (bind-keys :map evil-insert-state-map
                 ("C-g" . evil-normal-state)))