I fitted a Hyper-Pro lowering kit to my eldests F8GS - dropped it by 25mm and it does make a difference. My current ride came with the same kit fitted. Biggest problem for me is the fact that the side stand can be a pain to get fully down (it hasn't been shortened). Bike sits OK when on the side stand, it's just getting it down at times that can be a problem.
I've had non-lowered F8GS's in the past and like kwackboy, you just get used to planting one foot by sliding Your arse to one side. That said, the Adventure was WAAAY too tall for even that little trick too work for me.
Steve T