I've been looking for answers to this too and have found a really good add on solution that's great for working with long files and navigating the section headings within those files.
Using the Filter Lines package, you can not only filter for lines that match a string or regex, but also fold everything except your string/regex.
So to make life easier for LaTeX documents by folding everything in sections:
ctrl+shift+p -> Filter Lines: Fold with Regex
Then use the regex \\.*section\{ to fold all lines except sections, subsections and subsubsections; or customise to taste.
I'm using Sublime Text 3 but ST2 is supported by Filter Lines as well.

Goto Symbol(cmd-Rin Mac and it should bectr-Runder Window or Linux) allows you to jump to the various sections (and labels) – Guido May 06 '13 at 07:12\inputthem into a master-document.Also, I am using
– mSSM Jul 01 '13 at 12:24vim, and I have defined custom folding whenever e.g.<<<and>>>is encountered. I am sure sublime has something similar.