I've been getting better and better acquainted with surround.vim, and it's awesome. I mentioned ctrl-p in the other branch, and I stick by that as my most-used plugin.
What are yours?
I do not use Nerdtree so I do not know if it's better. Anyway, Project is not just a browser, it lets you filter files (by folder if necessary), hide some folders (useful for cache, tmp), reorganize your tree as you want (to put your most using folders in first).
It also automatically puts you at the root of your project, in short it is essential for me :)
@Andrew: I switched from Pathogen to Vundle a while ago and loved it - being able to just point it to Github and it will automatically download and install new stuff is absolutely amazing. I also personally couldn't live without vim-peepopen and PeepOpen (Mac only!) while doing development as well matchit.vim - github.com
+1 for Ctrl+P over Command-T, doesn't need a compile step and "feels" faster/easier-to-use.
TagBar is also a great CTags plugin.
Thanks for your feedback! Team Branch