Once you can't see the pixels, the display becomes infinitely flexible.
The biggest limitation for me is the single thunderbolt port. If I want to connect to ethernet, a display, or other thunderbolt devices (like an audio interface I have), I can only connect to one. Even on the 13" MBP, I can connect all three since there are two thunderbolt connections plus HDMI. The other biggest limitation has been video performance and CPU performance. I've ran into performance issues with virtualized boxes for local development and also with connecting an external display.
As far as retina, I could care less. It's nice, but not a necessity for me. Also, you get more battery life without it. That said, I'll still be moving to a MBP.
I'm impressed with the the 15inch retina starting specification. All the 15inch models come with 16GB of RAM for a starting price of £1,600. I always tell everybody if your doing graphical work or video production, get a desktop setup. The Intel isis pro GPU is more than enough for the work I do. extra £300 an average discrete mobile GPU on a laptop is not worth it.
http://i.imgur.com/1RgQSOc.png
http://blog.gatunka.com/2009/11/03/japanese-computers-still-...
This is your wife. We need to have a serious chat tonight.
I went from an 11in Macbook Air to the 13 MBP retina and I've not regretted it once. I carry my laptop around all day and I've not noticed the extra weight.
(The one thunderbolt on the Air means no Ethernet + Display at the same time, unless you're using a USB adapter... for which there are only two ports)
I like it, but it does get hot, and is quite heavy compared to the airs. I'm happy with it but I think they're missing a trick!