Visual Studio + Resharper Intellisense
I've always turned off the auto-appearance of intellisense in Visual Studio. I feel that it's faster to just finish typing the word than it is to pause slightly and pick the right one from the intellisense dropdown that appears. Whenever I'm typing something really long or when I'm not entirely sure what the method or class name is, then I just hit Ctrl+Space to make the intellisense appear on-demand.
Visual Studio 2010 + Resharper 5.1
In ReSharper's options:


And in Visual Studio's options:

That should do the trick. Enjoy!
Tags: .net, resharper