They've never been remotely necessary for general playthroughs, so in that case I don't really bother with that sort of thing outside of like, occasionally not wanting an absolutely craptastic nature on certain 'mons.
But it's not like I don't care about them at all either, as while I don't competitively battle anymore, I still usually engage in whatever version of the Battle Tower the generation has (where you do need to care about EVs/IVs/etc). And in addition to that, it is kind of nice to try to optimize certain favorites that will see long term usage (like my Volcarona and Zekrom).
Personally, I'd love to see IV's, EV's, and natures removed from the Pokemon games.
Just curious, why's that?