I still retain a Model 19 (-3), mainly because I feel that it a gun that one simply should have. It's my second one, after I foolishly traded away a nice nickel 19-2 years ago.
However, even in that nickel 19-2, I used Remington 125 gr JHPs. While I generally like heavier bullets, this was one of those cases where I went with the bulk of accumulated anecdotal information to suggest that these rounds simply worked, and worked very well, as a defensive offering.
My 19-2 did need minor repairs at one point, which cost me all of 25 dollars.
I don't use my 19-3 extensively, since I can get essentially the same performance out of my P229R in .357 Sig (with a hot loading), however if I were to regularly carry if for defense, I'd use 125 gr ammunition and simply dispose of the gun, or turn it into a paperweight, if it wore out or suffered irreversible wear/damage.
I'm not fond of the idea of potentially compromising the utility of a firearm to extend its life. All carry guns, by their nature, are disposable items.