Your stereotypical corridor cruiser is a harried executroid who is most often seen rushing by on the way to his or her next meeting. But this phrase likely would not have become as popular as it has (I found over 50 citations) if it didn't have a broader appeal. The corridor cruiser label has also been affixed to doctors and nurses on their rounds, warehouse employees, and even some types of retail worker.

Note that if your job mobility takes you out of the office, then you're a road warrior (1987), a phrase that is likely the inspiration behind a corridor cruiser synonym: corridor warrior (1999; aka a corridorior):

At the Canadian launch event in Toronto, Microsoft Canada president Frank Clegg predicted the Tablet PC is going to quickly become a "socially acceptable" device that will be a key technology in the workplace for everyone from road warriors to "corridor warriors" who spend much of their workday roaming between meetings. —"Outlook for Tablet PC unclear," globetechnology.com, November 7, 2002

(Thanks to subscriber Jack Kapica for passing along "corridor warrior.") Note, too, that corridor cruiser is also sometimes used for a portable device that enables a worker on walkabout to stay connected to their main computer:

Targeting office workers who require on-campus mobility, Toshiba will announce ultralight, ultrathin wireless notebooks based on the company's Portege 2000 series, nicknamed "corridor cruisers." —Ephraim Schwartz and Dan Neel, "Wireless, tablets to hold court," InfoWorld, June 24, 2002

A third sense of the phrase is a computer game in which the player navigates various corridors looking for someone or something to shoot:

Daikatana...is not a corridor cruiser with another boring monster sure to be around the next dank corner, exactly like the last and the next. —Steve La Rue, "Daikatana a graphically rich but deadly dance," The San Diego Union-Tribune, July 11, 2000

These games are also called corridor shooters, but the most common name is first-person shooter.