Presenting the Mac Pro to go, or the retina MacBook Pro. Comes with a built-in 30" screen!
Clearly the first thing I do is run the notebook at native resolution, an incredible 2880x1800. The menu bar nearly disappears, while the dock becomes reasonably-sized. For those incredulous readers, my 20/13 eyesight is sufficient for this resolution. :-)
An 1880px vertical is quite nice for web designing, albeit highly misleading for emulating typical usage.
Day-to-day use. I can fit a bunch of apps onto one virtual desktop, which is how I work on my 30" Dell. It's huge compared to my MacBook Air, which has a 1440x900 screen, and a lot less claustrophobic than my six-year-old MacBook Pro, which has a 1920x1200 screen.