Still fast enough for me.
Sure, I agree -- it's probably fast enough for most people, myself included. It's just the extra 1.5 sec of awake time (in your benchmark -- probably a lot less for real-world workflows, but if it happens on every mail sync, podcast download, it could multiply out to minutes of additional wake time per day) that bugs me because it will likely have an effect on battery life.
As hardware gets faster and (hopefully) less power-hungry, this should become less of an issue, so I expect I'll be happy to turn it on in a generation or two. I'm not there yet though. YMMV.