I've been using C# and thus Visual Studio Express over my usual python/vi setup, and Visual Studio practically forces the line of reasoning that results in code bubbles on you. It has a good start on navigation, but I'm finding setting up split panes in Visual Studio (same file or not) is quite cumbersome and not designed for quick edits. I can quickly put two functions side-by-side in vim, but the setup cost in Visual Studio feels much higher.
VS2010 made some improvements to this (RC is available here: http://msdn.microsoft.com/en-us/vstudio/dd582936.aspx). Now you can tear off tabs from the main window and place them on another screen, or tile them on the same screen. Also, now there's functionality to split a file into two viewing panes.
