I've always been fond of the stuff offered by Resharper.
Things like the refactorings and code style helpers.
The "Search Everywhere" feature that has been a JetBrains standard.

But lately I've been feeling that I don't need Resharper anymore.
There's a search everywhere in VS by default now: CTRL + T.
The refactorings have become a lot better and if you use Roslynator then you're not really missing anything.

I can't afford the fancy visual studio enterprise version for live testing, but instead I've been using NCrunch for my live testing.

I feel like having Resharper enabled isn't worth the performance cost.

But it might be that I haven't seen using Resharper to the full extend of its abilities and I'm overlooking some great things.

I'm curently using:
- Roslynator
- NCrunch
- Zencoding