Looking at the first question - I have tried to rid myself of using the term "pretty" to mean "almost" or "somewhat" as in the phrase "that was a pretty good movie". I feel that the term is just too slipshod, too awkward to use regularly.
I know that this is a silly example because there are many other terms that have been corrupted in exactly this way (taken up as a generalized superlative/modifier). Choosing to mount a one-man battle against this usage of "pretty" is not going to have any impact on the language beyond my own personal vocabulary.
I also try to use the phrase "would you like some help" instead of "do you need some help" and use "would you like..." instead of "want some..." because one mode of phrasing feels rough and final while the other feels softer and more empathetic.
Also I do not use the names of any gods in my speech at all unless I am speaking directly about a deity. Hearing people name their own gods in fits of frustration (as if the name were a curse) is mildly appalling, though rampant.
It's my opinion and surmise that people who are careful with their speech will develop skills which will allow for greater accuracy of expression than those who are not careful with their speech. Will this translate into faster promotions in the work place, more friends, increased facility in writing or speed in communication?
My guess is that the answer is no.
That doesn't mean there are not benefits to deveping a sensitivity to word choice, but it might mean that the benefits will be personal more than public, for you and not for anyone else.