I find I care about weight more the further I've been riding in a day, and the further I still have to go :)
Just find trail bikes a bit sluggish at times. Miss my old cotic, which went like hell if I had the legs. Part of that's big tyres and flat pedals on my current bike, part of it is weight.
My Big Dog is 15kg with a 130mm Yari, dropper, 29×2.6/4, SLX and Sunrace cassette.
But who cares about weight when you have 17 gear inches?