I got over thinking resist gear was an interesting approach after having to farm four sets back-to-back in SSC because we had a string of bad luck that kept taking away our tanks.
I don't find it a particularly fun or engaging as a stat stat. Either it's incidentally on gear and then it's boring, or you have to intentionally aim for it which is unexciting at best (when you have it) and frustrating at worst (when you don't). This is especially aggravated if it's actually part of the item budget and takes away throughput abilities. And, yeah, having to farm materials or spend gold to make special gear that is only useful for a short period or a limited number of fights is obnoxious. Waste of time, waste of gold, waste of bag space to carry it. No thanks on all fronts.
I think Wrath was the last time I ever had to deal with it in raid and I'm perfectly happy with that.