Hard to believe it's been over 12 years since my post a few pages back. Time flies!
I still use Decapitator and Tremolator quite a bit. I would still use PanMan if I had a preference to use panning effects these days.
PrimalTap is my go-to delay tone wise. There's nothing like it, so for me EchoBoy isn't really in use much.
My favorite use case for decapitator is essentially harmonic excitement.
I use the low cut to remove all but the mids and highs. I then distort the mids and highs moderately or heavily, usually with the EMI or Triode settings. I will set the high cut to taste to remove any harshness, then I will dial this back to between 10% and 40% on the mix knob.
This will prevent the low end from turning to mush while adding a lot of crispness or "excitement" if you will. It often feels like a magic trick. Amazing for a 13 year old piece of software!