The abstracts are always available, and nearly universally include the author's email address. I've yet to meet a scientist who wasn't enthusiastic to email a copy of their article to me. And I've had plenty of requests for my own papers that I've responded to, usually within hours or minutes. I don't think that the amount of delay incurred materially slows down the pace of scientific research. Frankly, I've got a pile of papers on my desk I'm meaning to read, all of which are days old, if not older. While this method of dissemination may be slightly annoying, it works very well for modern papers. Something published decades ago can be a lot harder to find via email, but generally it's a lot more useful to read current research than older results.