Well, dragging it from the trash is effectively the same as uninstalling in windows. and that's because in windows, it leaves behind bits and pieces of the application,but just a whole lot more than OS X leaves behind.
To do A REAL complete "Get RID OF" -
Before you have trashed the app - do a search for the app name, delete any corresponding folders, files, (such as preference files) and the application itself
If you have already trashed the app - the same search, only the application will not turn up in the search.
Honestly, just dragging the app to the trash is what i do because, these files are SO SMALL! Just leave em' there incase you need the app again, all you settings are still there.!