My paper scrapbooking is 12x12 because I like the 12x12 paper pads and often if you cut them to 8.5 x 11 it doesn't look right if the edges of the paper have any details. Or some that are not just a plain pattern but have border, etc. But I really haven't scrapped in like 2 years!
I have ordered a few snapfish/shutterfly albums that are 8.5 x 11 because those were buy 1 get 2 free.
I am doing Project Life this year, though I am way behind and the past month or so I haven't been great about taking pictures regularly. Next year I think I will try to do Project Life digitally. I love paper, but I am really trying to clear clutter and I just don't have the time and space to do paper scrapbooking, and the Project Life albums are really big, I do like that the digital items are much smaller to store.