Hi Jim,
As another Verizon customer of 20+ years, it has been rare for me to really wish that my phone were rooted. The few occasions were with previous phones to the S5 where it was impossible to turn off the bloatware.
For myself, there aren't any apps that I want to use that require being rooted.
I would "sort of" like to be able to freely do what I want with the extSDcard, but really, that is not even important because the only thing I use the extSDcard for is picture storage... and there, the camera settings will accept making the extSDcard the "default storage" device.
The exception to that is Screenshots, will only save to the internal storage.
I'm not a gamer, don't use any social apps, so don't feel the need for taking the risk of bricking the S5 just to enable a few features that Rooting will allow.
The use of MacroDroid has given me all the control over the phone's operation that I need/want, so rooting is of no benefit there either "for me".
The S5 is fast, it is much easier to find out something really quick with it than using a Desktop PC for the same searches. for some reason, the smartphone search routines do a better job of finding things I want than a PC web browser does.
ie, just today, on the back of this week's Time Magazine is a picture of a horse for a Longines advertisement. There is a man standing next to the horse that reminded me of Simon Baker of the TV show "The Mentalist"...
but, I did not have my reading glasses on, so could not read any of the fine print on the magazine cover..... but my S5 was in my shirt pocket, and I brought up Google, enter "the mentalist" and boom, up came Simon Baker's picture instantly.... and yup, the same guy as the advertisement...
For me, the S5 does everything I need it to do fast. It is an excellent research tool for quick and dirty searches for anything you want to know.
Can't see how rooting it would improve on my use of the phone.