So, as you can see a USB port replicator can be used similarly to the docking station to turn your laptop into a mobile system for convenience and portability.
build a laptop
If you need to take your laptop with you then just unplug the replicator from your laptop... when you come back home just plug it back in. You'll never have to connect or disconnect all of those devices again. Most importantly, you can connect many more devices, and all at the same time.