Thanks for the input. I just haven't been clear about what counts as a processor intensive task, which has made it kind of hard to gauge how the new macbook would work for me when reading the reviews. With my current computer (a 2012 Macbook pro, 2.9 i7 processor, 8gb ram), it's very rare that I see a spinning beach ball and there's no pattern when I do see it. So, I don't think I'm ever really pushing my current computer to its max.
Re/ my normal uses of a computer - I'm a student and teacher. I use word for writing projects, which can range from shorter (~30 pages) to book length (250-300 pages), which can make for larger file sizes. These documents sometimes include basic line drawing images and I use zotero for footnotes/bibliographic management. I also use powerpoint for creating basic slideshows for lecturing and excel as a gradebook. Occasionally, I'll edit a photo with photos. When doing those sorts of things, I'll also have safari, firefox, mail, and itunes going as well.