I think a lot of people use a laptop throughout the day like in our office - plugged into a large monitor, mouse, keyboard and put up on a desktop stand.
You then have the flexibility to just get up and walk into a meeting with it or walk out at the end of the day with everything just as you left it and carry on working on the train should you need.
Apple's official monitors double as docking stations, with USB/Firewire/Ethernet being carried over thunderbolt.
The most recent ones also half a decade old and still quite expensive, so I can't imagine buying one, but Apple would tell you that they do have a first-party docking station, complete with monitor built-in!
You could simply add a Thunderbolt or USB 3 dock....
Using an external keyboard and mouse solves the ergonomic problems of using a laptop for long periods. (Sad to say, I see very few people actually doing this.)
Of course, you don't get the benefits of running a faster, hotter processor, expandability etc, though Apple no longer offers a reasonably priced tower system anyway....
You then have the flexibility to just get up and walk into a meeting with it or walk out at the end of the day with everything just as you left it and carry on working on the train should you need.