There are two traversal shortcuts I use all the time: Ctrl-O and Ctrl-T.
Ctrl-O shows the methods of the class in the current editor in a popup. Hit Ctrl-O when the popup is up, and you'll see all the inherited methods as well. This is incredibly useful, as it allows me to bounce between methods even when I'm not sure which class is implementing which method.
Ctrl-T shows the type hierarchy of a selected type in a popup. This is the complement to Ctrl-O. When I'm sure of what interface I'm looking at, but I really want to pick a particular implementation and want to go trawling through that implementation for a bit, Ctrl-T will show me all the subclasses or implementors for that type.
There is a third option which I haven't used much. Ctrl-F3 shows the methods of a selected type in a popup. I can see how this can be useful, but in practice I have a pretty good idea of which methods are attached to which classes and Ctrl-Space fills most of my needs there.
However, I have been missing a couple of things. These are the shortcuts I just found recently, and are very good for hitting up random files:
Ctrl-E shows a popup list of all the open files.
Ctrl-Shift-T creates a dialog box that you can use to navigate to any class.
Ctrl-Shift-R creates a dialog box that shows any resource in the project (basically any file.)
Alternately, there's an Eclipse plugin called GotoFile which seems to behave a little more "IDEAish".
Finally, I found a plugin which actually integrates Eclipse with Windows! Eclipse Platform Extensions is actually functional and useful, although you wouldn't guess it by looking at the website. Although it says that it provides a "System GC" functionality, it actually does far more, like provide a "Open in Windows Explorer" and "Open Command Window here" dialog to the Package Explorer. You can even modify the commands used: I like to use "explorer.exe /e,/root,{0}" and "cmd.exe /C start c:\cygwin\bin\zsh.exe", for example.