I really don't think that Symfony2 projects are very different from any other PHP projects (at least vim-wise). The only optional plugin I use, Jinja highlights one , since Jinja's syntax is almost identical to Twig. I am also developing in Django, so I stuck with this, but there is also a Twig highlighting plugin if you want something that will be up to date with Twig.
If you want to see my vim files, they are on github , but there is nothing special in Symfony2 other than what I described above.
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