Given how many there are, I thought it might be interesting for those who haven't fully explored them yet to get some perspectives on which ones get used most often in your projects. 
 

I use the chorus one all the time. It's simply the best chorus plugin I have.

The Oil-Can Echo unit is really old school.  And the Stereo Delay unit is really useful and quick.  Finally, I don't know if it comes w/ the Blue-Tubes pack (I've got all the packages) is the Legends amp sim, which can be really good for putting an edge on vocals etc. w/ some of the clean settings.  I'm using Bit filter for that these days, but Legends certainly can do the job.  And it works on guitars, too!
 
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love the oil can and the chorus... is there an echo in here?

I confess I have never delved into them.  :o(
I use FabFilter stuff and ProChannel. Is there a BT module I really, really MUST try?

Skyline_UK
Is there a BT module I really, really MUST try?

That's the purpose of this thread 
 
Sounds like the Chorus and Oil Can Echo are gaining traction...

Oil Can here!

Another vote for the Chorus.  I also use the Imager on occasion to narrow stereo tracks (usually synths), and behind that would be the Delay, Phaser, Oil Can and Blue Verb.    For some reason I never seem to use the EQ or Compression plugins.   Perhaps I need to experiment more....
 

Hate to sound like a broken record but oil can and the chorus, although Multiply from the kvr challenge is creeping up on it. I also like the stereo image plug.

I also like the chorus.
 
The FA770 is a nice Fairchild style compressor, which I have set up as a PC effects chain.
 
I also like the PEQ2B Pultec emulation, and the PEQ5B, which is a little like a Pulteq on steroids.