I just love ReSharper (R#) by JetBrains, it has substantially increased my productivity while writing, and navigating code.

Quickly highlight all usages of a symbol within the current file.   To use,  place your cursor on the Type or Variable that you want to highlight then press Shift+Ctrl+F7

The Write operations are highlighted in light Red and the Read operations are highlighted in light Blue.  Pressing ESC removes the highlights. Furthermore, the R# Marker Bar to the right of your code uses to same colors to highlight all usages in the current file.  Just click on the horizontal mark to quickly navigate to the usage.