I do not have a strong preference between pathogen and vundle for package management. I have used both - but am currently using Vundle
My most invaluable plugin. Speeds up my ability to search for strings in both code and filenames then step through results from my query.
Vim indexes your text-editing history in extremely powerful ways. But a tree of changes with many branches can be a tough thing to visualize in your head. This plugin exposes just how powerful vim’s history is.
Fuzzy find files quickly and easily
Fugitive is a wrapper for git commands. It allows you to have a more efficient git workflow without ever leaving the comforts of vim.
Save custom snippets on a per file-type basis. Modeled after snippets in textmate.
Syntax highlighting for new HTML5 elements.
Syntax highlighting for sass.
Syntax highlighting for css3
I don’t currently use these plugins but have found them useful at times. Note that syntastic can choke a bit if you are editing extremely large files.