I'm not so much an experienced colleague as more of a rat bastard novice, but it sounds like you may want to check out Dreamweaver. I don't know if Zend does that, but I know for a fact DW does, and all you have to do is select the lines you want 'compressed' and click in the gutter. Honestly though I hardly ever use it myself, but then most of the classes I'm working with in my current project are only 2-400 lines in length, and I've found documenting phpDoc style has really helped with the organization.
-m