I want to have automatic creases for comments in my AquaEmacs.
You cannot have similar folds, as in Vim. I could not put folds in certain lines.
However, there is an Auctex addon that gives you Emacs-folds. They are not as flexible as in Vim.
Please let me know if you find the best solution.
take a look hs-minor-mode. it's not automatic though. for a more automatic approach, I think you could adjust the view mode as:
hs-minor-mode
hs-hide-comments-when-hiding-all
hs-hide-all-non-comment-function
hs-hide-all
. .
hideshow emacswiki.