And we will have to agree to disagree, I suppose. I am about 5 feet 9 inches I believe, and I see a lot of value from Economy Plus. Besides the legroom, it is about personal space.
I haven't flown longhaul in the dreaded LH Economy cabin for years, but I have logged many miles in AC Economy, and I notice a great difference in those seats compared to Economy Plus.
For me, $115 is 'peanuts' for long haul. My personal comfort and well being is worth far more than that.