I've had results that suggest merely doubling a small batch makes a noticeable difference, but I've only ever noticed it with NY style dough that was refrigerated for two days; probably because that may be the only kind of dough for which I've ever had a reason to make a double size batch.
Here are the specifics of my experience with this issue: My regular batch size is based on 1 lb of flour, with around 60% hydration, but occasionally I've made batches based on 2 lbs of flour, using the same formula as my normal dough. (As far as I recall, I've mostly only ever done this in preparation for making a bunch of pizzas for parties or large gatherings.) It may be important to note that I tend to make pizza on a very regular basis, usually without making any big formula changes from one dough batch to the next, which means I know what to expect from my dough.
Anyway, whenever I've made these larger-than-normal batches of dough, the dough has always risen faster than I anticipated. In fact, after experiencing this a number of times, it finally puzzled me enough to mention it somewhere on these boards. And when I did, Peter (Pete-zza) responded by directing me to a web page that discusses the mass effect. This web page described exactly what I was experiencing.
I don't mean to confuse you or contradict what Craig said; I just wanted to share my experience with you because it really puzzled me every time this happened (which was every time I've doubled my dough batch). However, for all I know, it was all in my head, even though I'm pretty sure it was real. Also, it didn't make a huge difference. Still, after a couple days of cold fermentation it was a big enough difference to make me worry that I might have to serve less than ideal pizzas to guests.
Don't freak out about it, though. Like I said, it was a pretty small difference, which wasn't very noticeable until after a couple days of cold fermentation. Also, since I had no clue why it was happening, that alone probably magnified the intensity in my mind. Since you at least know such a phenomenon exists, it shouldn't catch you by surprise or make you geek out like I may have.