I recently upgraded my MBP to a rMBP. However, if I could do it over, I would have "downsized" to an iMac though "downsize" isn't really the right word. After having laptops instead of desktops for the last 7 years, thanks to my iPad, I no longer need the portability of a laptop.
Other than the usual daily stuff like email and web-browsing, my laptop served 2 main purposes. I used it for the children's church I work with. Now I really only need it for documents. Everything else, lesson preparation, worship videos and displaying images are all done with my iPad and Apple TV now. The other purpose is the occasional video edit, just a few times a year.
My upgrade was mainly because I got rid of cable and after a few months I find my rMBP plugged in most of the time because it is either downloading or streaming TV shows. So if could do it over, I would revert back to a desktop and have gotten an iMac. Although I'll probably have this thing for many years, it'll likely be my last laptop.