While it’s hardly what’s expected of a solution since it’ll require some money out-of-pocket, this can be mitigated by purchasing a license for Visual Assist X. It’s seriously awesome. It takes some time to index your project, but boy does it work.
Caveat, it will never work as well or as fast as c# intellisense but it’s not something I can live without at this point. There’s a free trial for it, I believe. Give it a shot!