I'm not yet all-command-line all-the-time. (ACLATT?) Sometimes I use, say, browsers. So I've been liking MacVim.
I also like how alt-tab (or command-tab) switches between windows, while control-tab switches between tabs in my browser window. When I found out that MacVim windows can have multiple tabs too, I wanted control-tab to work there too. Hence, the newest (MacVim-specific) addition to my .vimrc:
" In MacVim, you can have multiple tabs open. This mapping makes
" ctrl-tab switch between them, like browser tabs.
" I don't think it matters whether I use noremap or map, unless
" :tabnext gets bound to something else, which would be weird.
noremap <c-tab> :tabnext<cr>