VMWare Fusion leaves dozens of files in /var/ that the Finder method does not locate. Using the Finder method left about 50+ files in the /var/ folders including some in the db folder. This will happen with a lot of apps that use very idiotic naming schemes. Skype leaves quite a few as well, but I cannot recall the name.
Most of these apps store things depending on user configurations, which is why even the installer by the developer won't work for all files. A computer will fill up with unnecessary files. It won't kill anyone to leave them though.
Please don't get me wrong. I'm not arguing that the Finder method is bad, nor that any software does the job better. I'm just saying that no method will ever clear all files. It isn't really a big deal to leave some behind. I don't want to argue against the methods that I've stated above (and you as well), as this may just add unnecessary worry to the OP.