ReSharper can optionally replace the Visual Studio DataTips with its own DataTips, which have a number of distinctions:
You can search for specific values in the current suspended-execution context. To do so, just start typing when the focus is in the DataTip. Note that the search will only find values in expanded nodes.
The DataTip disappears not when you remove the mouse pointer, but when you click anywhere outside the DataTip.
If a type neither has a meaningful ToString() override nor is it annotated with the [DebuggerDisplay] attribute, then the presentation of objects of this type in debugger views could be quite uninformative. In ReSharper DataTips, you can customize presentation of such objects on-the-fly. To do so, expand the type in the DataTip, right-click on the desired data members and choose Highlight Property: