I do, purely from an efficiency point of view.
Put it this way, if I look at 100 profiles, I can spend 10 seconds looking at every profile and only swipe those I actually want to meet (say 20) and of those maybe 10 will swipe back. Great, I've got 10 good matches for 1,000 seconds of effort.
On the other hand I can swipe instantly on 100 profiles taking maybe a second each and get maybe 25 matches. Of those I can then spend 10 seconds looking at each and pick the same 10 matches that I actually want to meet as in the first scenario. Time spent = 350 seconds.
So by swiping yes to everyone, I talk to the same people I'd talk to either way, but spend a lot less time going about it. For me there's no case of "will shag anything in a skirt" about it; a lot of my matches I never talk to, it's just the logical way to do it.