If you want ALL the files, do a spotlight search for the app, then move all the spotlight results to the trash. No real need, though, just the app itself to the trash is sufficient. The prefs, etc. are not large and do not take any space, so no harm in leaving them alone.
i have appzap and like it but your best bet is actually searching and deleting everything because most unistallers don't get rid of everything. But you are correct just dragging the application is not sufficient
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