When I first stopped going I realised that I had no Critical Thinking skills, which is why it took me so long to realise the WT/JW religion was totally false, so I set about learning how to think about things.
Now the old Bulls**t detector works 100% and I can spot the fallacies in an argument straight away, it is such a protection, I no longer accept anything without giving it some thought, and hence are not controlled by anyone elses thinking.
The WT kept all that ability far from me, as they do all their entrapped members.
I don't rate highly the TM School for public speaking skills, it is very basic, and you don't "progress" if you don't try hard yourself, so most MS and Elders are crap speakers, but, yes, I have no fear of public speaking which I may have had, perhaps, without the TMS.
DtoD holds no fear either of course, or cold calling by any method, but as I am not in sales those skills are never used.
Basically WT, thanks for two things, not much and sod-all.