iPhone 5 - Day to day texting, a handful of apps, phone calls
iPad mini - Used a few times a day for browsing, twitter crap, misc games, task tracking, light video watching around workout, reading magazines and books.
13in Retina MacBook Pro - Used almost exclusively at home connected to a IPS monitor. Used for most web browsing, document creation, admin tasks, Citrix back into my office, a few virtual servers. I love knowing I can take the Retina anywhere at any time, but I am seriously considering selling it and getting an iMac as it rarely leaves the house.
Gaming machine - Used to play a number of games exclusive to Windows my 13 in Retina cannot handle. In all honesty, used lightly making the case even more for a iMac.
I should note on my last business trip and vacation, I left the laptop at home and only brought the iPad mini with a wireless keyboard. Worked very well.