(((((Ellie))))) It is a numbers game, for sure. It makes sense. Back in the day you knew dozens of guys that were potential dates just in everyday life. And yet you would only actually date a small number of them, but you could figure out which ones, since you saw them and even talked to then in non-date situations. But with on-line dating, you date before you really know much of anything. It seems to me you could meet five, ten, maybe more, before you even find one you want to date. And if we try to do that serially (and I am like you, I really don't like the juggling) it is going to take forever!
I do agree, I can almost always tell in the first few minutes if there is mutual interest.