Many professors teaching MOOCs had a similarly positive outlook: Asked whether they believe MOOCs "are worth the hype," 79 percent said yes.

Many of those surveyed felt that these free online courses should be integrated into the traditional system of credit and degrees. Two-thirds believe MOOCs will drive down the cost of earning a degree from their home institutions, and an overwhelming majority believe that the free online courses will make college less expensive in general.

John Owens was drawn to MOOCs because of their reach. He also did not want to be left behind.

A number of the professors in the survey said they hoped to use MOOCs to increase their visibility, both among colleagues within their discipline (39 percent) and with the media and the general public (34 percent).

In May 2012, when the presidents of Harvard University and the Massachusetts Institute of Technology announced that they would enter the MOOC fray with $60-million to start edX, they were emphatic that their agenda was to improve, not supplant, classroom education.

"Online education is not an enemy of residential education," said Susan Hockfield, president of MIT at the time, from a dais at a hotel in Cambridge, "but an inspiring and liberating ally."

Typically a professor spent over 100 hours on his MOOC before it even started, by recording online lecture videos and doing other preparation. Others laid that groundwork in a few dozen hours.

Once the course was in session, professors typically spent eight to 10 hours per week on upkeep. Most professors managed not to be inundated with messages from their MOOC students—they typically got five e-mails per week

In all, the extra work took a toll. Most respondents said teaching a MOOC distracted them from their normal on-campus duties.

"It's out of 'my own' time, which is quite limited," Mr. Owens reported. "So, yes, other areas of my job suffered."

In lieu of credit toward a degree, most professors offer certificates to students who complete massive online courses. Three-quarters of the professors surveyed said they offered some sort of document certifying that a student had completed a MOOC. It remains unclear, however, how seriously those certificates are being taken by employers. College degrees are still seen as the coin of the realm.

Most professors who responded to The Chronicle's survey said they believed that MOOCs would drive down the cost of college; 85 percent said the free courses would make traditional degrees at least marginally less expensive, and half of that group said it would lower the cost "significantly."