Abram – I moved from a 15" MBP to a 13" MBA (with the same resolution). I have been completely satisfied. I have adequate screen real estate for most things. For me, Accordance was the deciding application. When a small screen is inadequate on the MBA, I would have had the same problem on the 15" MBP. I then just connect to an external monitor.
I don't think an 11" would have worked for me, but I've got an astigmatism and old eyes. (I've got an appointment with a surgeon to see about cataract surgery.) If your vision is good, an 11" might work. However, storage becomes an issue in my opinion – with either 11" or 13", you'd want to go with the better model with 256G SSD. 128G seems kinda tight.
Since my laptop is my main machine, I custom ordered and bumped up the processor, storage, and memory. It still came out much cheaper than the 13" Pro. Yes, the processor is not as fast, but I'm not doing a lot of photo or video editing. My laptop can still do those things, but I rarely do really processor intensive tasks. Accordance certainly doesn't require a Pro level machine.
When I bought my Air, the faster SSDs had just been introduced and had yet to come to the Pro line. So for just a little while, I had the fastest Mac laptop on the market – not clock speed, but 'getting the task done' speed. Now the Pros have the faster SSD & improved processing. Some will buy the Pro because they need it for other things. Some will buy it because they can. I am completely satisfied with my consumer level laptop – it does everything I need it to do and weighs less than 3 pounds. Additionally, the battery life if truly incredible. I consistently get more than 12 hours if I've rebooted recently. I think there have been times when I've gone over 14 hours. For someone who carries a laptop to school or work, you really don't need to take your brick with you.
Edited by Julie Falling, 20 June 2014 - 09:08 AM.